CVE-2025-51403

MediumPublic PoC

Published: 21 July 2025

Published

21 July 2025

Modified

07 August 2025

KEV Added

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Patch

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CVSS Score v3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

EPSS Score 0.0063 70.9th percentile

Risk Priority 13 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-51403 is a medium-severity Cross-site Scripting (CWE-79) vulnerability in Livehelperchat Live Helper Chat. Its CVSS base score is 6.5 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique JavaScript (T1059.007); ranked in the top 29.1% 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-2025-22260

Vulnerability details

A stored cross-site scripting (XSS) vulnerability in the department assignment editing module of of Live Helper Chat v4.60 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the Alias Nick parameter.

CWE(s): CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1059.007 JavaScript Execution

Adversaries may abuse various implementations of JavaScript for execution.

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 →

Why these techniques?

Stored XSS in department assignment Alias Nick field enables low-privileged attackers to inject arbitrary JavaScript executed in higher-privileged users' browsers (T1059.007), facilitating web session cookie theft (T1539).