CVE-2026-30919

HighPublic PoC

Published: 10 March 2026

Published

10 March 2026

Modified

13 March 2026

KEV Added

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Patch

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CVSS Score v3.1 7.6 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L

EPSS Score 0.0005 16.2th percentile

Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-30919 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Facilemanager Facilemanager. Its CVSS base score is 7.6 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Browser Session Hijacking (T1185); ranked at the 16.2th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-15 (Information Output Filtering).

Deeper analysis

CVE-2026-30919 is a stored cross-site scripting (XSS) vulnerability, also known as persistent or second-order XSS, in the fmDNS module of facileManager, a modular suite of web applications designed for system administrators. The issue affects versions prior to 6.0.4, where the application receives data from untrusted sources and includes it in subsequent HTTP responses without proper sanitization, as documented under CWE-79. The vulnerability was published on 2026-03-10 with a CVSS v3.1 base score of 7.6 (AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L).

An authenticated attacker with low privileges (PR:L) can exploit this over the network (AV:N) with low attack complexity (AC:L), though it requires user interaction (UI:R) such as a victim viewing the injected content. Exploitation enables high confidentiality impact (C:H), such as stealing session cookies or sensitive data, high integrity impact (I:H) like modifying displayed content, and low availability impact (A:L), with unchanged scope (S:U).

The GitHub security advisory at https://github.com/facileManager/facileManager/security/advisories/GHSA-2339-h9qw-q6vf confirms the vulnerability is fixed in facileManager 6.0.4, recommending upgrade to this version as the primary mitigation.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2026-10430

Vulnerability details

facileManager is a modular suite of web apps built with the sysadmin in mind. Prior to 6.0.4 , stored XSS (also known as persistent or second-order XSS) occurs when an application receives data from an untrusted source and includes that…

data in its subsequent HTTP responses in an unsafe manner. This vulnerability was found in the fmDNS module. This vulnerability is fixed in 6.0.4.

CWE(s): CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

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 →

Why these techniques?

Stored XSS directly enables browser session hijacking (T1185) and web session cookie theft (T1539) by allowing persistent injection of scripts that execute in other authenticated users' browsers, as explicitly noted by the cookie theft and content modification impacts.

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1