> CVE-2026-26247

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PUBLISHED
2026-07-03 21:16
MODIFIED
2026-07-03 21:16
EPSS (Prob. Exploit)
0.50%
Top 57.5%
DATA SOURCES:
NVD 🔗 2026-07-03 CWE MITRE 🔗 2026-11-01 FIRST EPSS 🔗 2026-11-01 GITHUB 🔗 2026-11-05 OSV 🔗 2026-11-02

> 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.

> AFFECTED_PRODUCTS

ℹ️ Aucun produit affecté n'a encore été publié par NVD pour cette CVE.

> WEAKNESSES

CWE-284

> CWE DETAILED DESCRIPTIONS

CWE-284: Improper Access Control - The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

> GITHUB SECURITY ADVISORY

GHSA-m5ch-ppfx-xv3v CRITICAL

Gitea OAuth2 PKCE S256 verifier bypass

AFFECTED PACKAGES:
GO / code.gitea.io/gitea
< 1.25.5
Fixed in: 1.25.5

> OSV (GOOGLE OPEN SOURCE VULNERABILITIES)

Gitea OAuth2 PKCE S256 challenges are not enforced during token exchange

AFFECTED PACKAGES:
Unknown / Unknown
44 versions affected
ALIASES:
GHSA-m5ch-ppfx-xv3v, GO-2026-6342

> HISTORIQUE DES MODIFICATIONS

Première apparition
03/07/2026 21:16
Source: NVD
📊 ENRICHISSEMENT 01/08/2026 06:01
CWE
Champ modifié: Description CWE
Ancienne valeur:
N/A
Nouvelle valeur:
CWE-284: Improper Access Control - The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
Total des modifications: 1 Dernière mise à jour: 3 months ago

> 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
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