CVE-2025-26565
Published: 26 March 2025
Summary
CVE-2025-26565 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 Malicious Link (T1204.001); ranked at the 29.3th 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).
Threat & Defense at a Glance
Threat & Defense Details
Mitigating Controls (NIST 800-53 r5)AI
Directly remediates the specific reflected XSS flaw in GNUPress by identifying, patching, and deploying updates to vulnerable versions <=0.2.9.
Filters information outputs to neutralize untrusted input during web page generation, preventing reflected XSS script execution in victims' browsers.
Validates user inputs to reject malicious payloads before processing, blocking the improper neutralization exploited in this GNUPress reflected XSS vulnerability.
MITRE ATT&CK Enterprise TechniquesAI
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.
NVD Description
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in kagla GNUPress gnupress allows Reflected XSS.This issue affects GNUPress: from n/a through <= 0.2.9.
Deeper analysisAI
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)