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 analytics tracking ID without sanitization. Attackers can close the inline script string literal with a crafted payload that executes in the browser of every visitor to the affected public booking page, enabling session cookie theft, forged authenticated requests, and wormable propagation by chaining with CSRF-able endpoints to persist payloads on additional events.

Affected products

Cal.Diy

CVSS 4.0

9.3 CRITICAL

CVSS 3.1

8.9 HIGH

EPSS

0.4% (35th percentile)

Weakness

CWE-79

NVD status

Received

Published

2026-08-12