CVE-2026-113429
Gitea stored XSS through legacy Actions artifact Content-Encoding
Description
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.
INFO
Published Date :
Nov. 1, 2026, 10:18 a.m.
Last Modified :
Nov. 1, 2026, 10:18 a.m.
Remotely Exploit :
No
Source :
88ee5874-cf24-4952-aea0-31affedb7ff2
Affected Products
The following products are affected by CVE-2026-113429
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Update to latest version to apply artifact handling fixes.
- Validate artifact content types before serving.
- Enforce Content-Security-Policy for artifact downloads.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-113429.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes 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.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-113429 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-113429 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 88ee5874-cf24-4952-aea0-31affedb7ff2
Nov. 01, 2026
Action Type Old Value New Value Added Description 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. Added CWE CWE-79 Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/113xxx/CVE-2026-113429.json">CVE-2026-113429</a> Added Reference https://blog.gitea.com/release-of-28.3.0/ Added Reference https://github.com/go-gitea/gitea/pull/39855 Added Reference https://github.com/go-gitea/gitea/pull/39996 Added Reference https://github.com/go-gitea/gitea/releases/tag/v28.3.0 Added Reference https://github.com/go-gitea/gitea/security/advisories/GHSA-9v6p-xpcp-7488