---
id: CVE-2026-113429
title: Gitea stored XSS through legacy Actions artifact Content-Encoding
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 th…
severity: none
cwe:
  - CWE-79
vendor: Gitea
product: gitea.dev
affected:
  - gitea.dev < 28.3.0
published: '2026-11-01'
updated: '2026-11-01'
sourceUpdated: '2026-11-01T09:48:32.206Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-113429'
references:
  - url: 'https://github.com/go-gitea/gitea/security/advisories/GHSA-9v6p-xpcp-7488'
    label: GitHub Security Advisory GHSA-9v6p-xpcp-7488
  - url: 'https://github.com/go-gitea/gitea/pull/39855'
    label: 'Fix: go-gitea/gitea pull request #39855'
  - url: 'https://github.com/go-gitea/gitea/pull/39996'
    label: 'Fix backport to release/v28: go-gitea/gitea pull request #39996'
  - url: 'https://blog.gitea.com/release-of-28.3.0/'
    label: Gitea 28.3.0 release announcement
  - url: 'https://github.com/go-gitea/gitea/releases/tag/v28.3.0'
    label: go-gitea/gitea v28.3.0 release
tags:
  - cve.org
epss: 0.00171
epssPercentile: 0.06547
ingestedAt: '2026-11-05T18:28:50.704Z'
---

## Overview

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.

## Affected

- `gitea.dev < 28.3.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.