Critical severity9.1NVD Advisory· Published Jul 3, 2026· Updated Jul 7, 2026
CVE-2026-26247
CVE-2026-26247
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
code.gitea.io/giteaGo | < 1.25.5 | 1.25.5 |
Affected products
2- osv-coordsRange: < 0.0.20260902T191204-160000.1.1
Patches
Vulnerability mechanics
References
9- github.com/advisories/GHSA-m5ch-ppfx-xv3vghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-26247ghsaADVISORY
- blog.gitea.com/release-of-1.25.5ghsaWEB
- github.com/go-gitea/gitea/commit/750649c1ef092c95f95b206b9d5fa17471a0b1f5ghsaWEB
- github.com/go-gitea/gitea/commit/bf8d11bb212ba2a76596d8a90e74e7d664571324ghsaWEB
- github.com/go-gitea/gitea/pull/36462nvdWEB
- github.com/go-gitea/gitea/pull/36477nvdWEB
- github.com/go-gitea/gitea/releases/tag/v1.25.5nvdWEB
- blog.gitea.com/release-of-1.25.5/nvd
News mentions
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