CVE-2026-57858: Cal.com Cal.diy 6.2.0 Stored XSS via BookingPageTagManager Analytics Tracking ID

Published Aug 12, 2026
·
Updated

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 Software

1 affected component
Cal.com Cal.com>=2.1.1<=6.2.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade Cal.com Cal.diy to a version that resolves this vulnerability.

    Fixed in 6.2.0
  2. Upgrade

    Upgrade Cal.com Cal.diy to a version that resolves this vulnerability.

    Fixed in 2.1.1
  3. Upgrade

    Upgrade Cal.com Cal.diy to a version that resolves this vulnerability.

    Fixed in 6.2.0Patch Stored XSS via BookingPageTagManager Analytics Tracking ID
  4. Configuration

    Ensure the BookingPageTagManager "Analytics Tracking ID" input is properly sanitized/validated to prevent stored XSS injection (the issue occurs when a malicious analytics tracking ID is supplied without sanitization).

    BookingPageTagManager (Cal.com Cal.diy) Analytics Tracking ID = Sanitize/validate to prevent injection (do not allow unsanitized JavaScript from the tracking ID)

Event History

Aug 12, 2026
CVE Published
via MITRE·12:23 PM
Data Sourced
via MITRE·12:23 PM
DescriptionSeverityWeakness
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Frequently Asked Questions

1

What is the severity of CVE-2026-57858?

CVE-2026-57858 has a severity rating of high, with a score of 8.9.

2

How do I fix CVE-2026-57858?

To fix CVE-2026-57858, upgrade Cal.com Cal.diy to a version above 6.2.0 where the vulnerability is resolved.

3

Who is affected by CVE-2026-57858?

Authenticated event owners using Cal.com Cal.diy versions 2.1.1 to 6.2.0 are affected by CVE-2026-57858.

4

What type of vulnerability is CVE-2026-57858?

CVE-2026-57858 is a stored cross-site scripting (XSS) vulnerability.

5

What can attackers do with CVE-2026-57858?

Attackers can exploit CVE-2026-57858 to inject arbitrary JavaScript code via a malicious analytics tracking ID.

Company

Resources

Contact

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CVE-2026-57858 - Cal.com Cal.diy 6.2.0 Stored XSS via BookingPageTagManager Analytics Tracking ID - SecAlerts