AUGUST 15, 2026
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Case File

CVE-2026-57858

HIGH · CVSS 8.9 EPSS 0.41% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-12 · Last synced 2026-08-15

CyberRota Analysis

AI-Generated

The BookingPageTagManager component in Cal.com Cal.diy versions 2.1.1 through 6.2.0 is vulnerable to a stored cross-site scripting (XSS) attack, allowing authenticated event owners to inject malicious JavaScript via unsanitized analytics tracking IDs. This vulnerability can lead to severe impacts, including session cookie theft and unauthorized actions on behalf of users, potentially enabling widespread exploitation through CSRF chaining. Organizations using affected versions should prioritize remediation to protect user data and maintain the integrity of their booking systems.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-57858
Severity
HIGH
CVSS
8.9
EPSS
0.41%
Java

Original NVD 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.