CVE-2024-58353
HighCVSS 8.9Exploitation Probability (EPSS)
Low risk22th percentile - higher than 22% of all known CVEs
Summary
XSS vulnerability in Cal.com (calcom/cal.diy) versions up to 4.7.15. Booking form field labels are rendered via React's dangerouslySetInnerHTML without proper sanitization, allowing injection of arbitrary HTML/JavaScript. Fixed in version 4.7.16.
Risk Assessment
An attacker can execute a script in the victim's browser when visiting the booking page, potentially leading to session theft or data leakage.
Recommendation
Update Cal.com to version 4.7.16 or later. For self-hosted instances with open registration, consider additional security measures.
Other vulnerabilities in Cal.com
See all- CVE-2025-71389Critical
Cal.com (calcom/cal.diy) before version 5.9.9 is vulnerable to unauthenticated remote code execution. The application bundles a version of Next.js whose React Server Components (RSC) request handling deserializes attacker-controlled input. A remote attacker can send a crafted RSC request and cause arbitrary code execution on the server without authentication or user interaction. The flaw originates from CVE-2025-55182 in Next.js and is fixed in version 5.9.9 by updating the dependency.
- CVE-2024-58354Critical
Vulnerability in the cal.com repository (later cal.diy) in GitHub Actions. The pr.yml workflow uses the pull_request_target trigger with default write permissions, allowing an attacker to execute arbitrary commands with the write-scoped GITHUB_TOKEN. An attacker can push commits, merge or mutate pull requests, add or delete comments, and delete or force-push branches.
- CVE-2024-58355High
Cal.com (calcom/cal.diy) through version 4.7.15 has a stored cross-site scripting (XSS) vulnerability in the single booking view (e.g., https://app.cal.com/booking/<id>). Booking-question field labels are rendered via React's dangerouslySetInnerHTML without sanitizing or escaping user input, allowing an attacker to inject arbitrary HTML/JavaScript.
- CVE-2023-37919Medium
Cal.com is scheduling software that has a vulnerability allowing active sessions to remain after enabling 2FA. When 2FA is activated on an account logged in on two or more devices, the other device(s) remain logged in without requiring identity verification.
Original NVD description (English source)
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.