Vulnerability · Published Jul 23, 2026 · Assigned by VulnCheck

CVE-2024-58353Cal.com through 4.7.15 Cross-Site Scripting via booking questions

High 8.9

In plain English

A high-severity security flaw in cal.diy from calcom. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities).

Severity (CVSS 3.1)8.9High

Exploit odds (30 days)0.4%top 63.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Cal.com (repository calcom/cal.diy) in versions <= 4.7.15 is vulnerable to cross-site scripting (XSS) on the publicly accessible single booking view (e.g., /booking/<id>). Booking question (form field) labels are rendered via React's dangerouslySetInnerHTML without proper input sanitization or CSP, so an attacker who can create an event type with a malicious booking question label can inject arbitrary HTML/JavaScript that executes when a victim visits the booking view URL. Self-hosted instances with open registration are particularly at risk. The issue is fixed in version 4.7.16.

Affected products (as reported)

Vendor	Product	Versions
calcom	cal.diy	0 – through 4.7.15

Weakness: CWE-80 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

References

GitHub Security Advisory (GHSA-vgj7-76cw-h6f8) vendor-advisory
Patch Commit patch
VulnCheck Advisory: Cal.com through 4.7.15 Cross-Site Scripting via booking questions third-party-advisory