CVE-2025-51401

MediumPublic PoC

Published: 21 July 2025

Published

21 July 2025

Modified

07 August 2025

KEV Added

—

Patch

—

CVSS Score v3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

EPSS Score 0.0057 69.0th percentile

Risk Priority 11 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-51401 is a medium-severity Cross-site Scripting (CWE-79) vulnerability in Livehelperchat Live Helper Chat. Its CVSS base score is 5.4 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked in the top 31.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2025-22145

Vulnerability details

A stored cross-site scripting (XSS) vulnerability in the chat transfer function of Live Helper Chat v4.60 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the operator name parameter.

CWE(s): CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1203 Exploitation for Client Execution Execution

Adversaries may exploit software vulnerabilities in client applications to execute code.

attack.mitre.org →

T1059.007 JavaScript Execution

Adversaries may abuse various implementations of JavaScript for execution.

attack.mitre.org →

T1185 Browser Session Hijacking Collection

Adversaries may take advantage of security vulnerabilities and inherent functionality in browser software to change content, modify user-behaviors, and intercept information as part of various browser session hijacking techniques.

attack.mitre.org →

T1539 Steal Web Session Cookie Credential Access

An adversary may steal web application or service session cookies and use them to gain access to web applications or Internet services as an authenticated user without needing credentials.

attack.mitre.org →

T1555.003 Credentials from Web Browsers Credential Access

Adversaries may acquire credentials from web browsers by reading files specific to the target browser.

attack.mitre.org →

Why these techniques?

Stored XSS enables arbitrary JavaScript execution in other operators' authenticated browser sessions during chat transfer, facilitating exploitation for client execution, JavaScript interpretation, browser session hijacking, web session cookie theft, and browser credential theft.