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Publish Advisories
GHSA-g7fp-cqj5-x8hf GHSA-rmhw-c3xr-m3xx GHSA-g7fp-cqj5-x8hf GHSA-rmhw-c3xr-m3xx
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‎advisories/github-reviewed/2026/03/GHSA-g7fp-cqj5-x8hf/GHSA-g7fp-cqj5-x8hf.json‎

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{
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"schema_version": "1.4.0",
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"id": "GHSA-g7fp-cqj5-x8hf",
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"modified": "2026-03-31T23:01:25Z",
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"published": "2026-03-26T12:30:29Z",
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"aliases": [
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"CVE-2026-4274"
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],
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"summary": "Mattermost has an Incorrect Authorization issue",
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"details": "Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to restrict team-level access when processing membership sync from a remote cluster, which allows a malicious remote cluster to grant a user access to an entire private team instead of only the shared channel via sending crafted membership sync messages that trigger team membership assignment. Mattermost Advisory ID: MMSA-2026-00574",
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"severity": [
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{
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"type": "CVSS_V3",
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"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
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}
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],
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"affected": [
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/mattermost/mattermost/server/v8"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "11.4.0-rc1"
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},
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{
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"fixed": "11.4.1"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/mattermost/mattermost/server/v8"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "11.3.0-rc1"
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},
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{
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"fixed": "11.3.2"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/mattermost/mattermost/server/v8"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "11.2.0-rc1"
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},
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{
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"fixed": "11.2.3"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/mattermost/mattermost/server/v8"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "10.11.0-rc1"
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},
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{
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"fixed": "10.11.11"
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}
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]
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}
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],
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"database_specific": {
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"last_known_affected_version_range": "< 10.11.1"
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}
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},
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/mattermost/mattermost/server/v8"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "8.0.0-20260105080200-d27a2195068d"
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},
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{
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"fixed": "8.0.0-20260217110922-b7d4a1f1f59b"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"type": "ADVISORY",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4274"
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},
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{
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"type": "PACKAGE",
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"url": "https://github.com/mattermost/mattermost"
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},
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{
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"type": "WEB",
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"url": "https://mattermost.com/security-updates"
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}
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],
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"database_specific": {
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"cwe_ids": [
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"CWE-863"
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],
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"severity": "MODERATE",
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"github_reviewed": true,
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"github_reviewed_at": "2026-03-31T23:01:25Z",
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"nvd_published_at": "2026-03-26T11:16:21Z"
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}
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}

‎advisories/github-reviewed/2026/03/GHSA-rmhw-c3xr-m3xx/GHSA-rmhw-c3xr-m3xx.json‎

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{
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"schema_version": "1.4.0",
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"id": "GHSA-rmhw-c3xr-m3xx",
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"modified": "2026-03-31T23:00:00Z",
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"published": "2026-03-25T18:31:53Z",
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"aliases": [
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"CVE-2026-27659"
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],
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"summary": "Mattermost doesn't properly validate CSRF tokens",
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"details": "Mattermost versions 11.2.x <= 11.2.2, 10.11.x <= 10.11.10, 11.4.x <= 11.4.0, 11.3.x <= 11.3.1 fail to properly validate CSRF tokens in the /api/v4/access_control_policies/{policy_id}/activate endpoint, which allows an attacker to trick an admin into changing access control policy active status via a crafted request. Mattermost Advisory ID: MMSA-2026-00578",
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"severity": [
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{
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"type": "CVSS_V3",
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"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N"
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}
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],
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"affected": [
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/mattermost/mattermost/server/v8"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "11.4.0-rc1"
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},
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{
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"fixed": "11.4.1"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/mattermost/mattermost/server/v8"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "11.3.0-rc1"
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},
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{
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"fixed": "11.3.2"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/mattermost/mattermost/server/v8"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "11.2.0-rc1"
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},
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{
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"fixed": "11.2.3"
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}
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]
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}
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]
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},
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/mattermost/mattermost/server/v8"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "10.11.0-rc1"
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},
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{
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"fixed": "10.11.11"
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}
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]
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}
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],
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"database_specific": {
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"last_known_affected_version_range": "< 10.11.1"
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}
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},
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{
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"package": {
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"ecosystem": "Go",
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"name": "github.com/mattermost/mattermost/server/v8"
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},
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"ranges": [
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{
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"type": "ECOSYSTEM",
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"events": [
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{
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"introduced": "8.0.0-20260105080200-d27a2195068d"
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},
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{
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"fixed": "10.11.11"
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}
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]
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}
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],
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"database_specific": {
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"last_known_affected_version_range": "< 8.0.0-20260217110922-b7d4a1f1f59b"
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}
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}
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],
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"references": [
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{
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"type": "ADVISORY",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-27659"
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},
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{
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"type": "PACKAGE",
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"url": "https://github.com/mattermost/mattermost"
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},
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{
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"type": "WEB",
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"url": "https://mattermost.com/security-updates"
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}
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],
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"database_specific": {
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"cwe_ids": [
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"CWE-352"
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],
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"severity": "MODERATE",
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"github_reviewed": true,
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"github_reviewed_at": "2026-03-31T23:00:00Z",
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"nvd_published_at": "2026-03-25T17:16:56Z"
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}
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}

‎advisories/unreviewed/2026/03/GHSA-g7fp-cqj5-x8hf/GHSA-g7fp-cqj5-x8hf.json‎

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‎advisories/unreviewed/2026/03/GHSA-rmhw-c3xr-m3xx/GHSA-rmhw-c3xr-m3xx.json‎

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