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

Quick assessment

Affected
Cal.com Cal.com Self-Hosted (Cal.diy)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Cal.com Cal.diy是Cal.com公司的一款日程安排管理软件。 Cal.com Cal.diy 2.1.1版本至6.2.0版本存在跨站脚本漏洞，该漏洞源于BookingPageTagManager组件未对恶意分析跟踪ID进行清理，导致认证的事件所有者能够注入任意JavaScript，攻击者可利用特制负载关闭内联脚本字符串字面量，在受影响公共预订页面的所有访客浏览器中执行，可能导致会话Cookie窃取、伪造认证请求，并可通过链接CSRF端点实现蠕虫式传播。

CVSS 8.9 · High EPSS 0.37% · P28

Affected Version Matrix 1

VendorProduct Version RangeStatus
Cal.com Cal.com Self-Hosted (Cal.diy) 2.1.1≤ 6.2.0 affected
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I. Basic Information for CVE-2026-57858

Vulnerability Information
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Vulnerability Title
Cal.com Cal.diy 6.2.0 Stored XSS via BookingPageTagManager Analytics Tracking ID
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
Source: CVE Program / CVE List V5
Vulnerability Title
Cal.com Cal.diy 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Cal.com Cal.diy是Cal.com公司的一款日程安排管理软件。 Cal.com Cal.diy 2.1.1版本至6.2.0版本存在跨站脚本漏洞，该漏洞源于BookingPageTagManager组件未对恶意分析跟踪ID进行清理，导致认证的事件所有者能够注入任意JavaScript，攻击者可利用特制负载关闭内联脚本字符串字面量，在受影响公共预订页面的所有访客浏览器中执行，可能导致会话Cookie窃取、伪造认证请求，并可通过链接CSRF端点实现蠕虫式传播。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Cal.com Cal.com Self-Hosted (Cal.diy) 2.1.1 ~ 6.2.0 -

II. Public POCs for CVE-2026-57858

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III. Intelligence Information for CVE-2026-57858

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Vendor Advisories for CVE-2026-57858 (1)

Security Blog Posts for CVE-2026-57858 (1)

IV. Related Vulnerabilities

Same vendor: Cal.com
Same weakness: CWE-79

V. Comments for CVE-2026-57858

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