What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-06 · updated 2026-10-15
• Weakness: CWE-667

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.

Affected products

• Gitea Open Source Git Server: before 28.0.0 — fixed in 28.0.0

How to fix

Upgrade to a fixed version: Gitea Open Source Git Server 28.0.0. Check the vendor advisory for mitigations.

References

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

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