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Vulnerability record · CVE-2026-26247 · published 3 July 2026

CVE-2026-26247: Improper access control vulnerability

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 3.1 Critical EPSS 0.50% · top 60.0% CWE-284 · Improper access control Deferred
9.1CVSS 3.1 base score
0.50%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
7 Jul 2026Last modified by NVD

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.

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

References

LinkTags
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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Source: NIST National Vulnerability Database (record CVE-2026-26247), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.