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Publish Advisories
GHSA-5724-x3rh-5qqq GHSA-g87c-r2jp-293w
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‎advisories/github-reviewed/2026/04/GHSA-5724-x3rh-5qqq/GHSA-5724-x3rh-5qqq.json‎

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{
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"schema_version": "1.4.0",
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"id": "GHSA-5724-x3rh-5qqq",
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"modified": "2026-04-01T00:24:13Z",
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"published": "2026-04-01T00:24:13Z",
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"aliases": [],
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"summary": "YesWiki has Multiple Reflected Cross-site Scripting Vulnerabilities",
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"details": "### Summary\n\nMultiple **reflected Cross-site Scripting (XSS)** vulnerabilities across both **authenticated and unauthenticated** portions of the application. These findings present a significant security risk, as they can be leveraged to execute arbitrary JavaScript in a victim’s browser under various contexts.\n\n## Impact and Exploitation\n\nWhile XSS is often treated as a standalone issue, these vulnerabilities have broader implications. Specifically, they can be used as **launch points to exploit other significant vulnerabilities**. \n\nProof of concept links follow. All testing was performed on my local docker setup running the lastest version of the application. \n\n## Proof of Concepts\n\n## Authenticated Reflected XSS\n\n```\nhttp://localhost:8085/?ElizabethJFeinler/deletepage&incomingurl=%22%3E%3Cscript%3Ealert(1)%3C%2fscript%3E\n```\n\n```\nhttp://localhost:8085/?BazaR&vue=saisir&action=saisir_fiche&id=%3Cscript%3Ealert(1)%3C%2fscript%3E\n```\n\n```\nhttp://localhost:8085/?GererThemes/upload&file=%3Cscript%3Ealert(1)%3C/script%3E\n```\n\n## Unauthenticated Reflected XSS\n\n\n```\nhttp://localhost:8085/?PagePrincipale/listpages&tags=%22%3E%3Cscript%3Ealert(1)%3C/script%3E\n```\n\nIn this one, most of the parameters can be used to deliver an XSS payload, not just the template parameter. \n\n```\nhttp://localhost:8085/?BazaR/bazariframe&id=2&template=<script>alert(1)</script>&width=100%25&height=600px&lat=46.22763&lon=2.213749&markersize=big&provider=MapBox&zoom=5&groups=&titles=&groupsexpanded=false\n```\n\n### Impact\n\nThe reflected XSS vulnerabilities identified pose a significant risk to both application integrity and user safety. When combined with other issues discovered such as insecure endpoints or improper authentication mechanisms. These XSS flaws can be leveraged to escalate access, hijack sessions, and in some cases, achieve remote code execution (RCE). For example, malicious JavaScript executed via XSS could be used to trigger authenticated requests that exploit backend vulnerabilities, ultimately allowing an attacker to execute arbitrary commands on the server or pivot deeper into the environment.\n\n### Mitigation\nUpdate to version 4.6.0",
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"severity": [
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{
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"type": "CVSS_V4",
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"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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": "Packagist",
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"name": "yeswiki/yeswiki"
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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": "4.6.0"
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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": "WEB",
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"url": "https://github.com/YesWiki/yeswiki/security/advisories/GHSA-5724-x3rh-5qqq"
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},
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{
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"type": "PACKAGE",
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"url": "https://github.com/YesWiki/yeswiki"
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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-79"
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],
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"severity": "MODERATE",
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"github_reviewed": true,
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"github_reviewed_at": "2026-04-01T00:24:13Z",
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"nvd_published_at": null
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}
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}

‎advisories/github-reviewed/2026/04/GHSA-g87c-r2jp-293w/GHSA-g87c-r2jp-293w.json‎

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{
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"schema_version": "1.4.0",
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"id": "GHSA-g87c-r2jp-293w",
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"modified": "2026-04-01T00:23:02Z",
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"published": "2026-04-01T00:23:02Z",
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"aliases": [
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"CVE-2026-34603"
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],
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"summary": "@tinacms/graphql's Media Endpoints Can Escape the Media Root via Symlinks or Junctions",
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"details": "## Summary\n\n`@tinacms/cli` recently added lexical path-traversal checks to the dev media routes, but the implementation still validates only the path string and does not resolve symlink or junction targets.\n\nIf a link already exists under the media root, Tina accepts a path like `pivot/written-from-media.txt` as \"inside\" the media directory and then performs real filesystem operations through that link target. This allows out-of-root media listing and write access, and the same root cause also affects delete.\n\n## Details\n\nThe dev media handlers validate user-controlled paths with:\n\n```ts\nfunction resolveWithinBase(userPath: string, baseDir: string): string {\n const resolvedBase = path.resolve(baseDir);\n const resolved = path.resolve(path.join(baseDir, userPath));\n if (resolved === resolvedBase) {\n return resolvedBase;\n }\n if (resolved.startsWith(resolvedBase + path.sep)) {\n return resolved;\n }\n throw new PathTraversalError(userPath);\n}\n\nfunction resolveStrictlyWithinBase(userPath: string, baseDir: string): string {\n const resolvedBase = path.resolve(baseDir) + path.sep;\n const resolved = path.resolve(path.join(baseDir, userPath));\n if (!resolved.startsWith(resolvedBase)) {\n throw new PathTraversalError(userPath);\n }\n return resolved;\n}\n```\n\nBut the validated path is then used directly for real filesystem access:\n\n```ts\nfilesStr = await fs.readdir(validatedPath);\n...\nawait fs.ensureDir(path.dirname(saveTo));\nfile.pipe(fs.createWriteStream(saveTo));\n...\nawait fs.remove(file);\n```\n\nThis does not account for symlinks/junctions already present below the media root. A path such as `pivot/secret.txt` can be lexically inside the media directory while the filesystem target is outside it.\n\n## Local Reproduction\n\nI verified this locally with a real junction on Windows.\n\nTest layout:\n\n- media root: `D:\\bugcrowd\\tinacms\\temp\\junction-repro4\\public\\uploads`\n- junction under media root: `public\\uploads\\pivot -> D:\\bugcrowd\\tinacms\\temp\\junction-repro4\\outside`\n- file outside the media root: `outside\\secret.txt`\n\nTina's current media-path validation logic was applied and used to perform the same list/write operations the route handlers use.\n\nObserved result:\n\n```json\n{\n \"media\": {\n \"base\": \"D:\\\\bugcrowd\\\\tinacms\\\\temp\\\\junction-repro4\\\\public\\\\uploads\",\n \"resolvedListPath\": \"D:\\\\bugcrowd\\\\tinacms\\\\temp\\\\junction-repro4\\\\public\\\\uploads\\\\pivot\",\n \"listedEntries\": [\n \"secret.txt\"\n ],\n \"resolvedWritePath\": \"D:\\\\bugcrowd\\\\tinacms\\\\temp\\\\junction-repro4\\\\public\\\\uploads\\\\pivot\\\\written-from-media.txt\",\n \"outsideWriteExists\": true,\n \"outsideWriteContents\": \"MEDIA_ESCAPE\"\n }\n}\n```\n\nThis shows the problem clearly:\n\n- the path validator accepted `pivot`\n- listing revealed a file from outside the media root\n- writing to `pivot/written-from-media.txt` created `outside\\written-from-media.txt`\n\nThe delete path uses the same flawed containment model and should be hardened at the same time.\n\n## Impact\n\n- **Out-of-root file listing** via `/media/list/...`\n- **Out-of-root file write** via `/media/upload/...`\n- **Likely out-of-root file delete** via `/media/...` `DELETE`, using the same path-validation gap\n- **Bypass of the recent path traversal hardening** for any deployment whose media tree contains a link to another location\n\nThis is especially relevant in development and self-hosted workflows where the media directory may contain symlinks or junctions intentionally or via repository content.\n\n## Recommended Fix\n\nHarden media path validation with canonical filesystem checks:\n\n1. resolve the real base path with `fs.realpath()`\n2. resolve the real target path, or for writes the nearest existing parent\n3. compare canonical paths rather than lexical strings\n4. reject any operation that traverses through a symlink/junction to leave the real media root\n\n`path.resolve(...).startsWith(...)` is not sufficient for filesystem security on linked paths.\n\n## Resources\n\n- `packages/@tinacms/cli/src/next/commands/dev-command/server/media.ts`\n- `packages/@tinacms/cli/src/server/models/media.ts`\n- `packages/@tinacms/cli/src/utils/path.ts`",
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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:H/PR:L/UI:N/S:U/C:H/I:H/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": "npm",
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"name": "@tinacms/graphql"
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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": "2.2.2"
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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": "<= 2.2.1"
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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": "WEB",
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"url": "https://github.com/tinacms/tinacms/security/advisories/GHSA-g87c-r2jp-293w"
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},
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{
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"type": "WEB",
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"url": "https://github.com/tinacms/tinacms/commit/f124eabaca10dac9a4d765c9e4135813c4830955"
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},
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{
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"type": "PACKAGE",
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"url": "https://github.com/tinacms/tinacms"
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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-22",
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"CWE-59"
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],
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"severity": "HIGH",
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"github_reviewed": true,
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"github_reviewed_at": "2026-04-01T00:23:02Z",
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"nvd_published_at": null
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}
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}

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