Information disclosure in Calcom Cal.diy
CVE-2026-9349
A vulnerability was determined in calcom cal.diy up to 4.9.4. Affected by this issue is the function getServerSideProps of the file apps/web/modules/bookings/views/bookings-single-view.getServerSideProps.tsx of the component Generic React API. This manipulation of the argument cancelledBy/rescheduledBy causes information disclosure. The attack can be initiated remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.
EPSS exploit prediction
EPSS: 0.005 (42.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 42nd percentile — 42.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.001
Affected products
- Calcom Cal.diy — versions 4.9.0, 4.9.1, 4.9.2
Weakness classification (CWE)
References
- vuldb.com/vuln/365312 (technical-description, vdb-entry)
- vuldb.com/vuln/365312/cti (signature, permissions-required)
- vuldb.com/submit/812177 (third-party-advisory)
- gist.github.com/YLChen-007/b59c44d1550c4b0f373ca4eb1c150994 (exploit)
Frequently asked questions
- What is CVE-2026-9349?
- CVE-2026-9349 is a medium-severity vulnerability in Calcom Cal.diy, classified under Information Disclosure. CVSS score: 5.3/10. Published 2026-05-24.
- How severe is CVE-2026-9349?
- Medium severity. CVSS v3 base score is 5.3 out of 10.