CVE-2026-57858
Cal.com Cal.diy 6.2.0 Stored XSS via BookingPageTagManager Analytics Tracking ID
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.
INFO
Published Date :
Aug. 12, 2026, 1:17 p.m.
Last Modified :
Oct. 24, 2026, 4:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | MITRE-CVE | ||||
| CVSS 4.0 | CRITICAL | 83251b91-4cc7-4094-a5c7-464a1b83ea10 | ||||
| CVSS 4.0 | CRITICAL | [email protected] |
Solution
- Update Cal.com Cal.diy to the latest version.
- Sanitize all user-supplied input.
- Validate analytics tracking IDs.
- Implement content security policy.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-57858.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-57858 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-57858
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-57858 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-57858 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Oct. 24, 2026
Action Type Old Value New Value Changed Translation Title: Cal.com Self-Hosted (Cal.diy) de Cal.com, Description: Las versiones 2.1.1 a 6.2.0 de Cal.com Cal.diy contienen una vulnerabilidad de cross-site scripting almacenado en el componente BookingPageTagManager que permite a los propietarios de eventos autenticados inyectar JavaScript arbitrario al proporcionar un ID de seguimiento de análisis malicioso sin sanitización. Los atacantes pueden cerrar el literal de cadena de script en línea con una carga útil diseñada que se ejecuta en el navegador de cada visitante de la página de reserva pública afectada, lo que permite el robo de cookies de sesión, solicitudes autenticadas falsificadas y propagación tipo gusano al encadenar con puntos finales vulnerables a CSRF para persistir cargas útiles en eventos adicionales. Title: Cal.com Self-Hosted (Cal.diy) de Cal.com, Description: Las versiones 2.1.1 a 6.2.0 de Cal.com Cal.diy contienen una vulnerabilidad de cross-site scripting almacenado en el componente BookingPageTagManager que permite a los propietarios de eventos autenticados inyectar JavaScript arbitrario al proporcionar un ID de seguimiento de análisis malicioso sin sanitización. Los atacantes pueden cerrar el literal de cadena de script en línea con una carga útil diseñada que se ejecuta en el navegador de cada visitante de la página de reserva pública afectada, lo que permite el robo de cookies de sesión, solicitudes autenticadas falsificadas y propagación tipo gusano al encadenar con puntos finales vulnerables a CSRF para persistir cargas útiles en eventos adicionales. -
CVE Translated by [email protected]
Oct. 23, 2026
Action Type Old Value New Value Added Translation Title: Cal.com Self-Hosted (Cal.diy) de Cal.com, Description: Las versiones 2.1.1 a 6.2.0 de Cal.com Cal.diy contienen una vulnerabilidad de cross-site scripting almacenado en el componente BookingPageTagManager que permite a los propietarios de eventos autenticados inyectar JavaScript arbitrario al proporcionar un ID de seguimiento de análisis malicioso sin sanitización. Los atacantes pueden cerrar el literal de cadena de script en línea con una carga útil diseñada que se ejecuta en el navegador de cada visitante de la página de reserva pública afectada, lo que permite el robo de cookies de sesión, solicitudes autenticadas falsificadas y propagación tipo gusano al encadenar con puntos finales vulnerables a CSRF para persistir cargas útiles en eventos adicionales. -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Aug. 13, 2026
Action Type Old Value New Value Added Reference https://ashtonr.com/blog/cve-2026-57858/ Added SSVC {'id': 'CVE-2026-57858', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-08-13T15:42:48.224743Z'} -
New CVE Received by [email protected]
Aug. 12, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'Cal.com', 'product': 'Cal.com Self-Hosted (Cal.diy)', 'versions': [{'status': 'affected', 'version': '2.1.1', 'versionType': 'semver', 'lessThanOrEqual': '6.2.0'}], 'defaultStatus': 'affected'}] Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L Added CWE CWE-79 Added Reference https://ashtonr.com/blog/cve-2026-57858/ Added Reference https://github.com/calcom/cal.com Added Reference https://www.vulncheck.com/advisories/cal-com-cal-diy-stored-xss-via-bookingpagetagmanager-analytics-tracking-id