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Advisories

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

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severity
high
date
Affecting

  • cal.diy <= 4.7.15

CWE
  • CWE-80 Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
CVSS
9.3
CVSS V4 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
Credit
xyzeva
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.

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