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TI-2024-38437 Aliases CVE-2024-58353GHSA-mxrg-5554-pp4x

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

Priority HIGH 73CWE-80Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
Passive
Attack complexity
Low
Attack requirements
None
Impact type
Cross-site scripting
Confidentiality · integrity · availability
High · High · Low
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-80.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00415 36th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
calcomcal.diyup to 4.7.15—No fix listedCNA
  • cal.diy Vendorcalcom Affected up to 4.7.15 Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    calcom cal.diy — GitHub Security Advisory (GHSA-vgj7-76cw-h6f8)

    2 records Highest priority Priority HIGH 2 HIGH

    Other records, highest priority first

    • TI-2024-38439 Cal.com through 4.7.15 Cross-Site Scripting via booking questionsPriority HIGH 75
    Show all 2 records → Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2024-58353
  2. 2026-10-03 Alias added: GHSA-mxrg-5554-pp4x

References

Patch 1

Advisory 1

  • TI-2024-38439 Cal.com through 4.7.15 Cross-Site Scripting via booking questions CVSS 4.0CRITICAL 9.3
  • TI-2024-38438 cal.com Repository Takeover via pull_request_target Workflow CVSS 4.0HIGH 8.5
  • TI-2026-08199 calcom cal.diy Generic React API bookings-single-view.getServerSideProps.tsx getServerSideProps information disclosure CVSS 4.0MEDIUM 6.9
  • TI-2023-19352 Cal.com not expiring old sessions after enabling 2FA CVSS 3.1MEDIUM 6.5
  • TI-2026-76231 Authorization bypass in cal.com and cal.diy webhook handler CVSS 4.0MEDIUM 5.3
  • TI-2026-71619 Improper privilege management in Cal.com credential deletion CVSS 4.0MEDIUM 5.3
See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences