CVE-2026-9304 calcom cal.diy Logo API route.ts validateUrlForSSRF server-side request forgery
Attackers can exploit a flaw in the Logo API to perform server-side request forgery, potentially accessing internal 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-2026-9304?
CVE-2026-9304 is a low-severity server-side request forgery vulnerability in calcom cal.diy, published on 23 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A security flaw has been discovered in calcom cal.diy up to 4.9.4. The affected element is the function validateUrlForSSRF of the file apps/web/app/api/logo/route.ts of the component Logo API. The manipulation results in server-side request forgery. It is possible to launch the attack remotely. Attacks of this nature are highly complex. The exploitability is described as difficult. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Weakness: CWE-918
Which versions are affected by CVE-2026-9304?
How do I fix CVE-2026-9304?
No fix has been published for CVE-2026-9304 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-2026-9304 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-9304 exists.
Sources
Also known as GHSA-6c7x-v3mr-g29x.