CVE-2026-26247

critical · 9.1

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.

9.1

CVSS

0.5%

EPSS (exploit prob.)

42nd

EPSS percentile

2026-07-03

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses

CWE-284

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-26247