Cyber Posture

CVE-2025-26565

High

Published: 26 March 2025

Published
26 March 2025
Modified
23 April 2026
KEV Added
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Patch
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CVSS Score 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L
EPSS Score 0.0018 39.8th percentile
Risk Priority 14 60% EPSS · 20% KEV · 20% CVSS

Description

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.

Security Summary

CVE-2025-26565 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, affecting the GNUPress WordPress plugin developed by kagla. The issue impacts all versions of GNUPress from its initial release through 0.2.9, as disclosed on March 26, 2025.

Unauthenticated attackers can exploit this vulnerability remotely over the network with low attack complexity, requiring user interaction such as clicking a malicious link. The CVSS v3.1 base score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L) reflects a high severity due to the changed scope, enabling script execution in the victim's browser context with low impacts on confidentiality, integrity, and availability, such as session hijacking or data theft.

The Patchstack advisory provides details on this vulnerability in the GNUPress WordPress plugin version 0.2.9 at https://patchstack.com/database/Wordpress/Plugin/gnupress/vulnerability/wordpress-gnupress-plugin-0-2-9-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve.

Details

CWE(s)
CWE-79

MITRE ATT&CK Enterprise Techniques

T1204.001 Malicious Link Execution
An adversary may rely upon a user clicking a malicious link in order to gain execution.
attack.mitre.org →
T1059.007 JavaScript Execution
Adversaries may abuse various implementations of JavaScript for execution.
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 →
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 plugin enables arbitrary JavaScript execution via malicious links (T1204.001, T1059.007), directly facilitating browser session hijacking (T1185) and web session cookie theft (T1539) as described.

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

References