Description
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 products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Gitea | Gitea Open Source Git Server | < 1.25.5 | 1.25.5 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | govulncheck-vulndb | 0.0.20260902T191204-160000.1.1 | SUSE-SU-2026:23712-1, SUSE-SU-2026:23692-1 |
| SLES 16.0 | govulncheck-vulndb | 0.0.20260902T191204-160000.1.1 | SUSE-SU-2026:23712-1, SUSE-SU-2026:23692-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | govulncheck-vulndb | 0.0.20260902T191204-160000.1.1 | openSUSE-SU-2026:21812-1 |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Go | code.gitea.io/gitea | < 1.25.5 | 1.25.5 | GHSA-m5ch-ppfx-xv3v |
Advisories 4
- SUSE-SU-2026:23692-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Sep 29, 2026
- SUSE-SU-2026:23712-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Sep 29, 2026
- openSUSE-SU-2026:21812-1 Security update for govulncheck-vulndb SUSE / openSUSE Security Updates · Sep 10, 2026
- WID-SEC-2026-0737 Gitea: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 7, 2026
References
- GitHub Pull Request #36462 patch
- GitHub Pull Request #36477 patch
- Gitea v1.25.5 Release release-notes
- Gitea v1.25.5 Release Blog Post release-notes