CVE-2026-104871Angular SSR: Path Traversal to Sibling Directories in CommonEngine on Windows
- 6.3MediumCVSS base score
- 0.42%Exploitation in 30 daysEPSS · top 63% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
The Angular SSR is a server-rise rendering tool for Angular applications. Prior to versions 20.3.36, 21.2.23, and 22.1.7, the CommonEngine retrieveSSGPage prerendered-page retrieval logic in @angular/ssr/node, and in @angular/ssr for versions 17 through 18, accepts a relative request URL containing a backslash parent-traversal segment on Windows. The non-special resolve:// URL base preserves the backslash, path.join interprets it as a Windows separator, and the pagePath.startsWith(normalize(publicPath)) check incorrectly accepts a sibling output directory whose name shares the configured public-directory prefix. An unauthenticated requester can therefore retrieve a sibling prerendered HTML page when that page contains the Angular SSG marker. The issue is limited to Windows deployments that pass relative request URLs to CommonEngine.render, have a prefix-sharing sibling output directory, and contain qualifying prerendered Angular HTML; it does not provide arbitrary file read. This issue is fixed in versions 20.3.36, 21.2.23, and 22.1.7.
Timeline
ID reserved
By GitHub_M
Published
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| GitHub_MCNA (assigner) | 4.0 | Medium6.3 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N |
| NVDNVD · Awaiting Analysis | 4.0 | Medium6.3 | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
- EPSS (exploitation in 30 days)
- 0.42% · top 63% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.3.
Affected products
- affected < 20.3.36
- affected >= 21.0.0, < 21.2.23
- affected >= 22.0.0, < 22.1.7
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- npm@angular/ssrGHSA-7g7c-h8rr-7p6q (opens in a new tab)
References
References8
- https://github.com/angular/angular-cli/security/advisories/GHSA-7g7c-h8rr-7p6q (opens in a new tab)x_refsource_CONFIRM
- https://github.com/angular/angular-cli/commit/645e41a47d21b7651837a4250de99af0509626e2 (opens in a new tab)x_refsource_MISC
- https://github.com/angular/angular-cli/commit/70748ca8e76fe4b42798719410336119d943e755 (opens in a new tab)x_refsource_MISC
- https://github.com/angular/angular-cli/commit/bb72145f9ab45aee29f523236b3a25cd0813a841 (opens in a new tab)x_refsource_MISC
- https://github.com/angular/angular-cli/commit/c3e5982e49705f0f6a913cb94622b4c555d2d914 (opens in a new tab)x_refsource_MISC
- https://github.com/angular/angular-cli/releases/tag/v20.3.36 (opens in a new tab)x_refsource_MISC
- https://github.com/angular/angular-cli/releases/tag/v21.2.23 (opens in a new tab)x_refsource_MISC
- https://github.com/angular/angular-cli/releases/tag/v22.1.7 (opens in a new tab)x_refsource_MISC
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-91778 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-7g7c-h8rr-7p6q (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-104871)Record last updated .