CVE-2025-68859
Published: 22 January 2026
Summary
CVE-2025-68859 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 20.3th 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).
Deeper analysis
CVE-2025-68859 is an Improper Neutralization of Input During Web Page Generation vulnerability, classified as Reflected Cross-site Scripting (XSS) under CWE-79, in the Syntax Highlighter Compress WordPress plugin by agmorpheus. The issue affects all versions of the syntax-highlighter-compress plugin from n/a through 3.0.83.3 inclusive. It was published on 2026-01-22 with a CVSS v3.1 base score of 7.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:L).
Attackers can exploit this vulnerability remotely over the network with low complexity and no privileges required, though it demands user interaction such as visiting a maliciously crafted webpage or clicking a link. Exploitation enables limited impacts on confidentiality, integrity, and availability within a changed scope, typically allowing script execution in the context of the targeted user's browser session.
The Patchstack advisory provides further details on this WordPress plugin vulnerability at https://patchstack.com/database/Wordpress/Plugin/syntax-highlighter-compress/vulnerability/wordpress-syntax-highlighter-compress-plugin-3-0-83-3-reflected-cross-site-scripting-xss-vulnerability?_s_id=cve.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-3991
Vulnerability details
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in agmorpheus Syntax Highlighter Compress syntax-highlighter-compress allows Reflected XSS.This issue affects Syntax Highlighter Compress: from n/a through <= 3.0.83.3.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Reflected XSS in public-facing WordPress plugin directly enables remote exploitation of web application (T1190) and client-side JavaScript execution in victim browser (T1059.007).
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
Directly requires validation and sanitization of untrusted input before web page generation, blocking the reflected XSS payload in the plugin.
Requires filtering of information outputs to neutralize script content, preventing execution of attacker-supplied code in the victim's browser context.
Mandates prompt remediation of identified flaws such as this CWE-79 vulnerability by applying the available plugin patch or removing the affected component.