CVE-2026-30918

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

EPSS Score 0.0004 13.3th percentile

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

Summary

CVE-2026-30918 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 Exploit Public-Facing Application (T1190); ranked at the 13.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

Threat & Defense at a Glance

What attackers do: exploitation maps to Exploit Public-Facing Application (T1190) and 3 other techniques.

Threat & Defense Details

Likely Mitigating ControlsAI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

CA-8 Penetration Testing

addresses: CWE-79

Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.

SI-10 Information Input Validation

addresses: CWE-79

Validates web inputs to reject script-related content that could produce XSS.

SI-15 Information Output Filtering

addresses: CWE-79

Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.

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 →

T1566.002 Spearphishing Link Initial Access

Adversaries may send spearphishing emails with a malicious link in an attempt to gain access to victim systems.

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 →

Why these techniques?

Reflected XSS in public-facing fmDNS web module enables direct exploitation of the app (T1190) to deliver/execute arbitrary JS payloads (T1059.007) via malicious links (T1566.002) that hijack browser sessions (T1185).

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

NVD Description

facileManager is a modular suite of web apps built with the sysadmin in mind. Prior to 6.0.4 , a reflected XSS occurs when an application receives data from an untrusted source and uses it in its HTTP responses in a…

way that could lead to vulnerabilities. It is possible to inject malicious JavaScript code into a URL by adding a script in a parameter. This vulnerability was found in the fmDNS module. The parameter that is vulnerable to an XSS attack is log_search_query. This vulnerability is fixed in 6.0.4.

Deeper analysisAI

CVE-2026-30918 is a reflected cross-site scripting (XSS) vulnerability, classified under CWE-79, affecting facileManager versions prior to 6.0.4. FacileManager is a modular suite of web applications designed for system administrators. The flaw resides in the fmDNS module, where the log_search_query parameter fails to properly sanitize user input, allowing malicious JavaScript code to be injected via a crafted URL and reflected in HTTP responses.

Exploitation requires an attacker to have low privileges (PR:L) and involves tricking a victim into interacting with a malicious URL (UI:R), such as by clicking a link. The attack is network-accessible (AV:N) with low complexity (AC:L) and no scope change (S:U). Successful exploitation executes arbitrary JavaScript in the victim's browser, yielding high confidentiality and integrity impacts (C:H/I:H) alongside low availability impact (A:L), as scored at 7.6 under CVSS v3.1.

The vulnerability is fixed in facileManager 6.0.4. Additional mitigation details are available in the GitHub security advisory at https://github.com/facileManager/facileManager/security/advisories/GHSA-284f-mff7-744x.