CVE-2026-26247
CRITICALCVSS 9.1/10EPSS 0.17%
Last modified
CVE-2026-26247 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.. EPSS estimates a 0.17% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
Source: CNA advisory (CVE.org). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Gitea | Gitea Open Source Git Server | < 1.25.5 |
References
Timeline
- Published
- Last Modified
- Status
- Deferred
Frequently Asked Questions
What is CVE-2026-26247?
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.
How severe is CVE-2026-26247?
CVE-2026-26247 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-26247?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
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Are you affected by CVE-2026-26247?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST