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.
Published: 2026-07-03
Score: 9.1 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Tue, 07 Jul 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 06 Jul 2026 23:15:00 +0000

Type Values Removed Values Added
First Time appeared Gitea
Gitea gitea Open Source Git Server
Vendors & Products Gitea
Gitea gitea Open Source Git Server

Fri, 03 Jul 2026 20:45:00 +0000

Type Values Removed Values Added
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.
Title Gitea OAuth2 PKCE S256 challenges are not enforced during token exchange
Weaknesses CWE-284
References

Subscriptions

Gitea Gitea Open Source Git Server
cve-icon MITRE

Status: PUBLISHED

Assigner: Gitea

Published:

Updated: 2026-07-07T16:59:17.604Z

Reserved: 2026-03-03T03:25:28.654Z

Link: CVE-2026-26247

cve-icon Vulnrichment

Updated: 2026-07-07T16:21:49.787Z

cve-icon NVD

No data.

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-07-08T17:15:02Z

Weaknesses