CVE-2026-113429 json
Gitea stored XSS through legacy Actions artifact Content-Encoding
published 8d ago modified 3d ago also EUVD-2026-114792
- cvss
- 5.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 6%
- public exploits
- 0
- none known
Summary
Legacy (v1 to v3) Actions artifact uploads stored the request's `Content-Encoding` header unchecked in the column that is served as the artifact's `Content-Type` on download, and a value starting with `video/` or `audio/` also removed the sandboxing Content-Security-Policy. A user who can run an Actions job could upload an artifact that a browser renders as HTML on the Gitea origin when the direct artifact download URL is opened, and the URL is reachable anonymously on public repositories. A victim who opens the link runs the attacker's script with their own session, which for an administrator means control of the instance. Legacy uploads now store only the `gzip` marker, and the special serve headers are chosen only for valid media types.
Patch / fix
- Gitea Gitea 28.3.0
- github.com/go-gitea/gitea#39855 pull request
- github.com/go-gitea/gitea#39996 pull request
- github.com/go-gitea/gitea/releases/tag/v28.3.0 release
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Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3d ago
Exploit prediction
0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
| CNA | 3.1 | 5.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N |
Affected products
- Gitea Gitea
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/go-gitea/gitea/pull/39855
patch
-
github.com
/go-gitea/gitea/pull/39996
patch
-
github.com
/go-gitea/gitea/security/advisories/GHSA-9v6p-xpcp-7488
vendor-advisory
-
blog.gitea.com
/release-of-28.3.0/
release-notes
-
github.com
/go-gitea/gitea/releases/tag/v28.3.0
release-notes
Sources
- CVE List CVE-2026-113429
- NVD CVE-2026-113429
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