CVE-2026-26247

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.

PUBLISHED Reserved 2026-03-03 | Published 2026-07-03 | Updated 2026-07-07 | Assigner Gitea

Problem types

CWE-284

Product status

Credits

Aisle Research reporter

References

github.com/go-gitea/gitea/pull/36462 (GitHub Pull Request #36462) patch

github.com/go-gitea/gitea/pull/36477 (GitHub Pull Request #36477) patch

github.com/go-gitea/gitea/releases/tag/v1.25.5 (Gitea v1.25.5 Release) release-notes

blog.gitea.com/release-of-1.25.5/ (Gitea v1.25.5 Release Blog Post) release-notes

cve.org (CVE-2026-26247)

nvd.nist.gov (CVE-2026-26247)

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