What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 8.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-23 · updated 2026-07-30
• Weakness: CWE-80

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

• calcom cal.diy: through 4.7.15

References

• https://github.com/calcom/cal.diy/commit/00689fda0a30b8f933c096f02c1fe092a4206def
• https://github.com/calcom/cal.diy/security/advisories/GHSA-vgj7-76cw-h6f8
• https://www.vulncheck.com/advisories/cal-com-through-cross-site-scripting-via-booking-questions
• https://github.com/calcom/cal.diy/security/advisories/GHSA-vgj7-76cw-h6f8

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