critical9.1
CVE-2026-26247
Gitea versions before 1.25.5 do not persist the OAuth2 PKCE S256 challenge method correctly during authorization, allowing token exchange without the expected …
Impact
Gitea versions before 1.25.5 do not persist the OAuth2 PKCE S256 challenge method correctly during authorization, allowing token exchange without the expected verifier check.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | code.gitea.io/gitea | < 1.25.5 | 1.25.5 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-m5ch-ppfx-xv3v
- https://nvd.nist.gov/vuln/detail/CVE-2026-26247
- https://github.com/go-gitea/gitea/pull/36462
- https://github.com/go-gitea/gitea/pull/36477
- https://blog.gitea.com/release-of-1.25.5
- https://github.com/go-gitea/gitea/releases/tag/v1.25.5
- https://github.com/go-gitea/gitea/commit/750649c1ef092c95f95b206b9d5fa17471a0b1f5
- https://github.com/go-gitea/gitea/commit/bf8d11bb212ba2a76596d8a90e74e7d664571324
- https://blog.gitea.com/release-of-1.25.5/