CVE-2024-58353CWE-80

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

Critical · published July 23, 2026

CVSS v4.0
9.3
EPSS
0%
Percentile
34.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
9.3 · CRITICAL
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
EPSS
0.00415 · 34.8th percentile
Weakness
CWE-80 · Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
Published
2026-07-23T21:16Z
EPSS history
Timeline
  • 23 JUL 21:16Z
    Cal.com through 4.7.15 Cross-Site Scripting via booking questions
    cvelistv5