Vulnerability · Published Jul 23, 2026 · Assigned by VulnCheck

CVE-2024-58355Cal.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 (calcom/cal.diy) versions through 4.7.15 contain a stored cross-site scripting vulnerability. The single booking view (e.g., https://app.cal.com/booking/<id>) renders booking-question field labels via React's dangerouslySetInnerHTML without sanitizing or escaping user input. An attacker who can create an event type with a malicious booking-question label can inject arbitrary HTML/JavaScript that executes when a victim opens the crafted booking URL. The issue is fixed in v4.7.16.

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