CVE-2026-105636 Plane: SSRF via HTTP redirect in webhook delivery (allow_redirects not set)
An attacker can exploit Server-Side Request Forgery in Plane to access internal resources and cloud metadata by leveraging unvalidated HTTP redirects in webhook deliveries.
- 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-2026-105636?
CVE-2026-105636 is a critical 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 webhook delivery task in apps/api/plane/bgtasks/webhook_task.py calls requests.post() without allow_redirects=False and does not validate redirect targets. validate_url() blocks private, loopback, link-local, and reserved addresses in the original webhook URL, but the final URL reached after one or more redirects is not checked. A user who can create a workspace can register a webhook pointing to an attacker-controlled public endpoint that returns a 302 redirect to an internal address. The Plane worker then fetches internal resources, including cloud metadata, and stores the response body in webhook_logs, where the attacker can retrieve it through the workspace webhook-logs API. This issue is fixed in 1.4.0.
Weakness: CWE-918
Which versions are affected by CVE-2026-105636?
How do I fix CVE-2026-105636?
No fix has been published for CVE-2026-105636 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-2026-105636 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105636 exists.
Sources
Also known as GHSA-mq87-52pf-hm3h.