CVE-2026-9303 calcom cal.diy cross-site request forgery
Attackers can perform unauthorized actions on behalf of authenticated users in Cal.com due to missing CSRF protections.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-9303?
CVE-2026-9303 is a medium-severity vulnerability in calcom cal.diy, published on 23 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
A vulnerability was identified in calcom cal.diy up to 4.9.4. Impacted is an unknown function. The manipulation leads to cross-site request forgery. It is possible to initiate the attack remotely. The exploit is publicly available and might be used. The vendor was contacted early about this disclosure but did not respond in any way.
Which versions are affected by CVE-2026-9303?
How do I fix CVE-2026-9303?
No fix has been published for CVE-2026-9303 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-9303 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-9303 exists.
Sources
Also known as GHSA-m2vm-mcmh-jrc7.