CVE-2024-58353
Stored XSS in Cal.com booking view allows attacker-controlled JS execution
Is CVE-2024-58353 being exploited?
Not confirmed. CVE-2024-58353 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.41% probability of exploitation in the next 30 days.
How severe is CVE-2024-58353?
CVE-2024-58353 is rated Critical with a CVSS score of 9.3. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2024-58353?
Yes. A fix has been recorded for CVE-2024-58353. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2024-58353 affect?
CVE-2024-58353 affects Cal.com (calcom/cal.diy) <= 4.7.15, Self-hosted Cal.com instances with open registration. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2024-58353?
Upgrade to Cal.com v4.7.16, disable open registration, add input sanitization/CSP
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Stored XSS via booking question labels; attacker can execute JS in visitors' browsers, enabling session theft, phishing, CSRF and account takeover.
Immediate action required
- affected<= 4.7.15
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.