Detections
Analytics

CVE-2026-26247

critical

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.

References

https://github.com/go-gitea/gitea/releases/tag/v1.25.5

https://github.com/go-gitea/gitea/pull/36477

https://github.com/go-gitea/gitea/pull/36462

https://blog.gitea.com/release-of-1.25.5/

Details

Source: Mitre, NVD

Published: 2026-07-03

Updated: 2026-07-07

Risk Information

CVSS v2

Base Score: 9.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

Severity: High

CVSS v3

Base Score: 9.1

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

Severity: Critical

EPSS

EPSS: 0.00166