CVE-2026-104973 Plane: DNS Rebinding Bypass of CVE-2026-30242 SSRF Fix in Webhook Delivery
Attackers can bypass SSRF protections in Plane webhook delivery via DNS rebinding, potentially accessing internal network resources.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-104973?
CVE-2026-104973 is a high-severity server-side request forgery vulnerability in makeplane plane, published on 5 Oct 2026. An attacker needs administrator access to exploit it, 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-2026-30242 validates webhook IP addresses only when the webhook is created in apps/api/plane/app/serializers/webhook.py. The delivery task in apps/api/plane/bgtasks/webhook_task.py performs a separate DNS resolution when sending the request and does not validate the resolved IP address, allowing DNS rebinding to bypass the SSRF protection. This issue is fixed in 1.4.0.
Weakness: CWE-918
Which versions are affected by CVE-2026-104973?
How do I fix CVE-2026-104973?
No fix has been published for CVE-2026-104973 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-2026-104973 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-104973 exists.