What’s Vulnerable › Vulnerabilities

CVE-2024-58355: 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 (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

• 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-2
• https://github.com/calcom/cal.diy/security/advisories/GHSA-vgj7-76cw-h6f8

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