CVE-2026-57858 — HIGH (8.9)

Vulnerability Description

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.

CVSS Score

8.9

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

LOW

Related Weaknesses (CWE)

CWE-79

References

FAQ

What is CVE-2026-57858?

CVE-2026-57858 is a vulnerability with a CVSS score of 8.9 (HIGH). 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 JavaS...

How severe is CVE-2026-57858?

CVE-2026-57858 has been rated HIGH with a CVSS base score of 8.9/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-57858?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.