CVE-2026-104976 Plane: SSRF in Gitea OAuth
An attacker can exploit unvalidated Gitea OAuth host and avatar URLs to force the server to make requests to internal network resources.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104976?
CVE-2026-104976 is a high-severity server-side request forgery vulnerability in makeplane plane, published on 5 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Plane is an open-source project management tool. Prior to 1.4.0, Plane validates GITEA_HOST only for its URL scheme and does not reject hosts that resolve to private or internal IP addresses. The four outbound requests in the Gitea OAuth flow are derived from this unvalidated host and do not call validate_url(). In addition, avatar_url is taken from the Gitea user's profile, where users can configure external avatar URLs. After an administrator enables Gitea OAuth for a legitimate instance, a Gitea user can set an internal URL as the profile avatar and log in through Gitea, causing Plane to fetch the internal target without validation. This issue is fixed in 1.4.0.
Weakness: CWE-918
Which versions are affected by CVE-2026-104976?
How do I fix CVE-2026-104976?
No fix has been published for CVE-2026-104976 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-104976 being exploited?
There is no known exploitation of CVE-2026-104976 in the wild and no public exploit code.
Sources
Also known as GHSA-hx79-5pj5-qh42.