CVE-2026-26247

UNKNOWN 0.0

Gitea OAuth2 PKCE S256 challenges are not enforced during token exchange

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-284
Vendor	gitea
Product	gitea open source git server
Published	Jul 3, 2026

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Affected Versions

Gitea / Gitea Open Source Git Server

0 < 1.25.5

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/go-gitea/gitea/pull/36462 github.com: https://github.com/go-gitea/gitea/pull/36477 github.com: https://github.com/go-gitea/gitea/releases/tag/v1.25.5 blog.gitea.com: https://blog.gitea.com/release-of-1.25.5/

Credits

🔍 Aisle Research