CVE-2026-20779: Gitea TOTP single-use enforcement defect allows OTP replay

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-03 · updated 2026-10-25
Weakness: CWE-294

Description

Gitea versions from 1.5.0 before 1.26.3 have a TOTP single-use enforcement defect that allows a valid TOTP code to be accepted more than once across web two-factor authentication flows and the Basic Auth X-Gitea-OTP path.

Affected products

Gitea Open Source Git Server: from 1.5.0 before 1.26.3 — fixed in 1.26.3

How to fix

Upgrade to a fixed version: Gitea Open Source Git Server 1.26.3. Check the vendor advisory for mitigations.

References

https://blog.gitea.com/release-of-1.26.3-and-1.26.4/
https://github.com/go-gitea/gitea/pull/38151
https://github.com/go-gitea/gitea/releases/tag/v1.26.3
https://github.com/go-gitea/gitea/security/advisories/GHSA-gx3v-q759-g323
https://github.com/go-gitea/gitea/security/advisories/GHSA-gx3v-q759-g323

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