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

What is CVE-2026-103670?

CVE-2026-103670 is a high-severity vulnerability in Gitea Gitea, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-667

Which versions are affected by CVE-2026-103670?

1 open source package ship an affected version, including gitea. It affects 1 product.

Products include Gitea Gitea.

How do I fix CVE-2026-103670?

Upgrade gitea to 28.0.0 or later.

Is CVE-2026-103670 being exploited?

There is no known exploitation of CVE-2026-103670 in the wild and no public exploit code.

Other vulnerabilities in Gitea Gitea

• CVE-2026-60004 Gitea Code Injection Exploited Critical 9.8
• CVE-2026-73278 Gitea WebAuthn bypass during OAuth and OIDC sign-in Critical 9.8
• CVE-2026-94205 Gitea fork workflow approval bypass through maintainer-triggered events Critical 9.8
• CVE-2022-42968 Gitea vulnerable to Argument Injection Critical 9.8
• CVE-2021-45330 Improper Privilege Management in Gitea Critical 9.8

All Gitea Gitea vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-gitea-2026-103670, GHSA-4j4g-m7mr-hp5j, MINI-7q7p-wjcq-prhf, MINI-pp3r-3f92-rm2f.