NewApp Monitoring is liveSign up free
AgentbeamBeta
Open-source package vulnerability · Go

CVE-2026-26247: Gitea OAuth2 PKCE S256 verifier bypass

criticalCVSS 3.1 9.1GHSA-m5ch-ppfx-xv3v

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 Jul 3, 2026 · Updated Sep 1, 2026

Affected packages

code.gitea.io/gitea

Ecosystem
Go
Affected
< 1.25.5
Fixed in
1.25.5
Check
go list -m code.gitea.io/gitea

Advisory details

From the GitHub Advisory Database (CC BY 4.0).

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

How this page is made: the data panel comes from the GitHub Advisory Database, CISA’s KEV catalog, the NVD and FIRST EPSS, and updates twice a day. No analysis has been written for this entry yet. Methodology

More Go vulnerabilities

All Go entries