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advisory-database[bot]advisory-database[bot]
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Publish Advisories
GHSA-2v3w-6g35-5f9v GHSA-44mv-jq72-gj49 GHSA-m5rv-56xx-hfc6 GHSA-ph22-fw5m-w2q9 GHSA-xv2p-wchj-qjhp GHSA-2v3w-6g35-5f9v GHSA-44mv-jq72-gj49 GHSA-m5rv-56xx-hfc6 GHSA-ph22-fw5m-w2q9 GHSA-xv2p-wchj-qjhp
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‎advisories/github-reviewed/2026/03/GHSA-2v3w-6g35-5f9v/GHSA-2v3w-6g35-5f9v.json‎

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{
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"schema_version": "1.4.0",
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"id": "GHSA-2v3w-6g35-5f9v",
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"modified": "2026-03-17T19:59:39Z",
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"published": "2026-03-16T15:30:42Z",
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"aliases": [
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"CVE-2026-25783"
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],
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"summary": "Mattermost fails to properly validate User-Agent header tokens",
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"details": "Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly validate User-Agent header tokens which allows an authenticated attacker to cause a request panic via a specially crafted User-Agent header. Mattermost Advisory ID: MMSA-2026-00586",
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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:N/I:N/A:L"
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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": "0"
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},
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{
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"fixed": "8.0.0-20260129181235-1346cf529aef"
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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"
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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": "0"
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},
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{
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"fixed": "5.3.2-0.20260129181235-1346cf529aef"
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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"
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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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},
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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"
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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"
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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": "11.3.1"
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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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"references": [
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{
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"type": "ADVISORY",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25783"
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},
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{
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"type": "WEB",
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"url": "https://github.com/mattermost/mattermost/commit/1346cf529aef0672c39a56ec10d1b8a9c8fb387d"
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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-1287"
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],
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"severity": "MODERATE",
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"github_reviewed": true,
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"github_reviewed_at": "2026-03-17T19:59:39Z",
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"nvd_published_at": "2026-03-16T14:18:23Z"
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}
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}

‎advisories/github-reviewed/2026/03/GHSA-44mv-jq72-gj49/GHSA-44mv-jq72-gj49.json‎

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{
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"schema_version": "1.4.0",
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"id": "GHSA-44mv-jq72-gj49",
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"modified": "2026-03-17T19:59:53Z",
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"published": "2026-03-16T15:30:42Z",
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"aliases": [
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"CVE-2026-26246"
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],
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"summary": "Mattermost fails to bound memory allocation when processing PSD image files",
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"details": "Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to bound memory allocation when processing PSD image files which allows an authenticated attacker to cause server memory exhaustion and denial of service via uploading a specially crafted PSD file. Mattermost Advisory ID: MMSA-2026-00572",
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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:N/I:N/A:L"
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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": "0"
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},
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{
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"fixed": "8.0.0-20260115183946-38b413a27604"
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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"
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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": "0"
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},
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{
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"fixed": "5.3.2-0.20260115183946-38b413a27604"
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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"
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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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},
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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"
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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"
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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": "11.3.1"
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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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"references": [
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{
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"type": "ADVISORY",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-26246"
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},
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{
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"type": "WEB",
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"url": "https://github.com/mattermost/mattermost/commit/38b413a27604e8721fbe008f8ec4b4e6c47ad4f0"
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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-789"
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],
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"severity": "MODERATE",
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"github_reviewed": true,
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"github_reviewed_at": "2026-03-17T19:59:53Z",
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"nvd_published_at": "2026-03-16T14:18:26Z"
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}
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}

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