CVE-2026-104977 Server-side request forgery in plane
Authenticated users can exploit incomplete SSRF protections to access internal cloud metadata and read sensitive data via link unfurling.
- 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-2026-104977?
CVE-2026-104977 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, the fix for CVE-2026-27706 and GHSA-jcc6-f9v6-f7jw, an SSRF in work-item link unfurling shipped in v1.2.2, remains incomplete in the v1.3.1 GA release. Any authenticated project member can make the server fetch attacker-selected internal targets, including cloud metadata at 169.254.169.254, and read the response body returned as the link title or favicon. Complete hardening exists on main in PR 9163 but was not included in an earlier released tag. This issue is fixed in 1.4.0.
Weakness: CWE-918
Which versions are affected by CVE-2026-104977?
How do I fix CVE-2026-104977?
No fix has been published for CVE-2026-104977 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-2026-104977 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104977 exists.
Sources
Also known as GHSA-hhj8-7hv6-m74r.