CSRF in Calcom Cal.diy
CVE-2026-9303
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.
Vulnerability class: CSRF (Cross-Site Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (12.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Calcom Cal.diy — versions 4.9.0, 4.9.1, 4.9.2
Weakness classification (CWE)
References
- vuldb.com/vuln/365250 (vdb-entry)
- vuldb.com/vuln/365250/cti (signature, permissions-required)
- vuldb.com/submit/812173 (third-party-advisory)
- vuldb.com/submit/812175 (third-party-advisory)
- gist.github.com/YLChen-007/26663d9558e15994176dc420d2e11d48 (related)
- gist.github.com/YLChen-007/dafada36e356bc895b09829d8ec57e49 (exploit)
Frequently asked questions
- What is CVE-2026-9303?
- CVE-2026-9303 is a medium-severity vulnerability in Calcom Cal.diy, classified under Cross-Site Request Forgery (CSRF). CVSS score: 4.3/10. Published 2026-05-23.
- How severe is CVE-2026-9303?
- Medium severity. CVSS v3 base score is 4.3 out of 10.