CVE-2026-104627 Gitea OpenID account linking without session binding
Attackers can hijack user accounts by linking their OpenID identity to a victim's session, bypassing local authentication checks like TOTP.
- 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
- None listed
What is CVE-2026-104627?
CVE-2026-104627 is a medium-severity authentication bypass vulnerability in Gitea, published on 18 Oct 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
The Gitea OpenID association callback in the security settings accepted a positive OpenID 2.0 assertion without checking that the signed-in user had started the linking. Because OpenID 2.0 allows unsolicited assertions, an attacker-controlled OpenID provider could attach the attacker's identity to the account of a signed-in victim who opened a crafted link, and the attacker could then sign in as the victim through OpenID login, which does not apply the local TOTP or WebAuthn checks. The callback now requires a time-limited `state` value bound to the user.
Which versions are affected by CVE-2026-104627?
How do I fix CVE-2026-104627?
No fix has been published for CVE-2026-104627 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-104627 being exploited?
There is no known exploitation of CVE-2026-104627 in the wild and no public exploit code.
Sources
Also known as GHSA-mf69-7pqq-86vx.