XSS in Cal.com Self-hosted (Cal.diy)
CVE-2026-57858
Cal.com Cal.diy versions 2.1.1 through 6.2.0 contain a stored cross-site scripting vulnerability in the BookingPageTagManager component that allows authenticated event owners to inject arbitrary JavaScript by supplying a malicious analytic…
Vulnerability class: XSS (Cross-Site Scripting)
CVSS v3 metric
CVSS v3 base score 8.9 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L.
Affected products
- Cal.com Self-hosted (Cal.diy) — versions 2.1.1
Weakness classification (CWE)
Public proof-of-concept exploits
References
- disclosure@vulncheck.com (product)
- disclosure@vulncheck.com (technical-description)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-57858?
- CVE-2026-57858 is a high-severity vulnerability in Cal.com Self-hosted (Cal.diy), classified under Cross-site Scripting. CVSS score: 8.9/10. Published 2026-08-12.
- How severe is CVE-2026-57858?
- High severity. CVSS v3 base score is 8.9 out of 10.
- Is CVE-2026-57858 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.