Cyber Resilience

CVE-2025-55409

HighPublic PoC

Published: 25 August 2025

Published
25 August 2025
Modified
09 September 2025
KEV Added
—
Patch
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CVSS Score v3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.0023 45.9th percentile
Risk Priority 18 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-55409 is a high-severity Cross-site Scripting (CWE-79) vulnerability in Foxcms Foxcms. Its CVSS base score is 8.8 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 45.9th 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-2025-55409 is a Cross-Site Scripting (XSS) vulnerability in FoxCMS version 1.2.6, affecting the /index.php/article component. Published on 2025-08-25T16:15:31.590, it carries a CVSS v3.1 base score of 8.8 (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) and maps to CWE-79.

The vulnerability can be exploited remotely by unauthenticated attackers over the network with low complexity, requiring user interaction such as viewing a malicious page or clicking a crafted link. Successful exploitation enables attackers to execute arbitrary code in the victim's browser context, resulting in high impacts to confidentiality, integrity, and availability.

Mitigation details are available in advisories referenced at http://foxcms.com and https://www.notion.so/CVE-2025-55409-2222b2fd0210804facb7cfe5d9db1ebd.

EU & UK References

Vulnerability details

FoxCMS 1.2.6, there is a Cross Site Scripting vulnerability in /index.php/article. This allows attackers to execute arbitrary code.

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 →
Why these techniques?

XSS in public-facing CMS component directly enables exploitation of the app (T1190) and arbitrary JavaScript execution in browser (T1059.007).

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

CVEs Like This One

CVE-2025-55420Same product: Foxcms Foxcms
CVE-2025-50692Same product: Foxcms Foxcms
CVE-2025-25789Same product: Foxcms Foxcms
CVE-2025-25790Same product: Foxcms Foxcms
CVE-2025-29306Same product: Foxcms Foxcms
CVE-2026-3231Shared CWE-79
CVE-2025-23481Shared CWE-79
CVE-2025-69302Shared CWE-79
CVE-2025-23734Shared CWE-79
CVE-2025-23571Shared CWE-79

Affected Assets

foxcms
foxcms
1.2.6

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Validates inputs to /index.php/article preventing injection of malicious scripts characteristic of this XSS vulnerability.

SI-15 Information Output Filtering good match
prevent

Filters and encodes outputs from /index.php/article to block execution of arbitrary code in victims' browsers.

SI-2 Flaw Remediation good match
prevent

Remediates the specific XSS flaw in FoxCMS 1.2.6 through timely patching or code corrections.

References