CVE-2026-120263
When `[oauth2_client].ACCOUNT_LINKING` is set to `auto` (not the default) and registration is…
- Risk score
- 65/100
- CVSS
- 9.8 v3.1
- Exploit chance (30 days)
- 0.2%
- Published
- 1 Nov 2026
Open in the live forecast Today's forecast
What to know
- What it is
- When [oauth2_client].ACCOUNT_LINKING is set to auto (not the default) and registration is enabled, the link-account sign-up form looked up the existing account to link by the user name or email submitted in the form instead of the identity asserted by the OAuth2 provider. An attacker with an account on a configured OA…
- Affected
- See advisory
- Fix
- Apply the vendor's security update; see the linked advisory.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 9.8 critical
- Remotely exploitable without logging in
References
Original description
When `[oauth2_client].ACCOUNT_LINKING` is set to `auto` (not the default) and registration is enabled, the link-account sign-up form looked up the existing account to link by the user name or email submitted in the form instead of the identity asserted by the OAuth2 provider. An attacker with an account on a configured OAuth2 provider could submit another user's name, link their external identity to that Gitea account and be signed in as it without its password, including as an administrator. The link persisted for later sign-ins. Automatic linking now only happens when the existing account matches the provider's email or provider-derived user name; otherwise the account password is required.
Last activity 1 Nov 2026. Patch Forecast updates every hour.