CVE-2026-26247 | Gitea versions before 1.25.5 do not persist the OAuth2 PKCE …

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.

Metadata

CVE ID: CVE-2026-26247
State: PUBLISHED
Assigner: Gitea
Reserved: 2026-03-03 03:25 UTC
Published: 2026-07-03 20:19 UTC
Last updated: 2026-07-03 20:19 UTC
Primary CWE: CWE-284
CWE-284
Vendor / Product: Gitea / Gitea Open Source Git Server
Sources: cve.org · NVD

Severity & Metrics

No CVSS data available.

Affected products (1)

Vendor	Product	Platform	Versions
Gitea	Gitea Open Source Git Server	—	0 < 1.25.5

Weakness (CWE)

CWE	Source	Description
CWE-284	cna	CWE-284

References (4)

GitHub Pull Request #36462 https://github.com/go-gitea/gitea/pull/36462
GitHub Pull Request #36477 https://github.com/go-gitea/gitea/pull/36477
Gitea v1.25.5 Release https://github.com/go-gitea/gitea/releases/tag/v1.25.5
Gitea v1.25.5 Release Blog Post https://blog.gitea.com/release-of-1.25.5/