Gitea stored XSS through legacy Actions artifact Content-Encoding
CVSS score
—
EPSS probability
%0.2
Risk score
—
Published
4 h ago
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Vulnerability description
DayBreach AI Explanation
Verified against sourcesSources read
2
Source agreement
Tam uyum
Evidence confidence
%63
Short explanation
Legacy Gitea Actions artifact uploads stored the Content-Encoding header unchecked, serving it as Content-Type upon download. Certain header values removed the sandboxing Content-Security-Policy, allowing browsers to render the artifact as HTML. This flaw enables attackers to hijack user sessions or compromise the instance.
Since direct artifact download URLs are anonymously reachable on public repositories and victim sessions run attacker scripts, an administrator falling victim can lead to full instance control.
What should be done?
- Upgrade Gitea to the fixed version.
- Apply official vendor advisories and patches.
- Review Actions artifact upload configurations.
Chain of evidence and sources
Eski v1 ile v3 arası Actions artifact yüklemeleri, isteklerin Content-Encoding üst bilgisini denetlemeden saklamaktadır.
video/ veya audio/ ile başlayan değerler, koruyucu Content-Security-Policy politikasını kaldırmaktadır.
Yönetici seviyesindeki bir kurbanın bağlantıyı açması örnek üzerinde kontrol sağlanmasıyla sonuçlanabilir.
Show the technical text from the sources
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.
CWE: CWE-79
This explanation was compiled automatically from the source records. Scores, active exploitation, patch and exploit status come straight from the sources.
IMPACT: Affected Products and Software
Affected Products
The following products are affected by CVE-2026-113429 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.
| ID | VENDOR | PRODUCT | ACTION |
|---|---|---|---|
| 1 | gitea | gitea | View |
RED HAT CSAF/VEX: Product Impact Check
SCORING: CVSS from Multiple Sources
CVSS Scores
The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.
| SCORE | VERSION | SEVERITY | VECTOR | SOURCE |
|---|---|---|---|---|
| The sources have not yet published a verified CVSS metric. | ||||
Patch and Remediation Guide
Solution & Remediation Advisory
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Public exploit and active exploitation status
Verified exploit intelligence
No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.
Weakness Classification and Attack Patterns (CWE & CAPEC)
CWE - Common Weakness Enumeration
While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-113429 is associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-113429 weaknesses.
Official Sources and Advisories
Similar Vulnerabilities
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