CVE-2025-51396

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 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-2025-51396 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 Exploit Public-Facing Application (T1190); 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-2025-22149

Vulnerability details

A stored cross-site scripting (XSS) vulnerability in Live Helper Chat v4.60 allows attackers to execute arbitrary web scripts or HTML via injecting a crafted payload into the Telegram Bot Username parameter.

CWE(s): CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access

Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.

attack.mitre.org →

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 →

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 the browser of privileged users (e.g., admins) viewing the Telegram Bot configuration, exploiting the public-facing web application (T1190), executing JavaScript (T1059.007), and facilitating theft of web session cookies (T1539) or browser credentials (T1555.003).