CVE-2025-27269

High

Published: 03 March 2025

Published

03 March 2025

Modified

23 April 2026

KEV Added

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Patch

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CVSS Score v3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L

EPSS Score 0.0021 43.0th percentile

Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2025-27269 is a high-severity Cross-site Scripting (CWE-79) vulnerability. Its CVSS base score is 7.1 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 43.0th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

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

Deeper analysis

CVE-2025-27269 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the .htaccess Login block WordPress plugin developed by Anton Aleksandrov. The issue affects all versions of the plugin from its initial release (n/a) through 0.9a inclusive. Published on 2025-03-03, it carries a CVSS v3.1 base score of 7.1.

The vulnerability can be exploited remotely over the network (AV:N) with low attack complexity (AC:L), requiring no privileges (PR:N) but user interaction (UI:R), and results in a changed scope (S:C) with low impacts on confidentiality, integrity, and availability (C:L/I:L/A:L). Unauthenticated attackers can deliver malicious payloads via reflected input on affected sites, tricking logged-in users or administrators into executing scripts in their browsers, potentially leading to session hijacking, data theft, or further site compromise within the plugin's context.

The Patchstack advisory provides further details on this WordPress plugin vulnerability, including assessment and recommended actions: https://patchstack.com/database/Wordpress/Plugin/htaccess-login-block/vulnerability/wordpress-htaccess-login-block-plugin-0-9a-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve.

EU & UK References

🇪🇺 ENISA EUVD: EUVD-2025-5600

Vulnerability details

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in Anton Aleksandrov .htaccess Login block htaccess-login-block allows Reflected XSS.This issue affects .htaccess Login block: from n/a through <= 0.9a.

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 →

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?

Reflected XSS in public-facing WordPress plugin enables remote exploitation via T1190; facilitates session hijacking through browser script execution allowing cookie theft via T1539.

Confidence: MEDIUM · MITRE ATT&CK Enterprise v19.0