CVE-2026-20779 Gitea TOTP single-use enforcement defect allows OTP replay
Attackers can replay valid TOTP codes to bypass two-factor authentication and take over user accounts in Gitea.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-20779?
CVE-2026-20779 is a high-severity authentication bypass vulnerability in Gitea Open Source Git Server, published on 3 Jul 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official 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.
Weakness: CWE-294
Which versions are affected by CVE-2026-20779?
3 open source packages ship an affected version, including code.gitea.io/gitea.
| Package | Affected | Fixed in |
|---|---|---|
code.gitea.io/gitea Go | From 1.5.0 | 1.26.3 |
code.gitea.io/gitea Go | From 1.5.0 | 1.26.3 |
code.gitea.io/gitea Go | From 1.5.0 | 1.26.3 |
How do I fix CVE-2026-20779?
Upgrade code.gitea.io/gitea to 1.26.3 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-20779 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-20779 exists.
Sources
Also known as GHSA-gx3v-q759-g323, GO-2026-6057.