CVE-2026-81776: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in advanpix WP QuickLaTeX

CVE-2026-81776 is an unauthenticated cross-site scripting (XSS) vulnerability in WP QuickLaTeX affecting versions up to and including 3.8.8. The flaw arises from improper neutralization of input during web page generation, allowing attackers to inject malicious scripts that execute in the context of users' browsers. The CVSS 3.1 base score is 7.1, reflecting network attack vector, low attack complexity, no privileges required, user interaction required, and impacts on confidentiality, integrity, and availability. The vulnerability is publicly disclosed but no vendor remediation or patch is currently documented.

Successful exploitation of this vulnerability could allow remote attackers to execute arbitrary scripts in the context of users visiting the affected web pages, potentially leading to data theft, session hijacking, or other malicious actions impacting confidentiality, integrity, and availability of the application and its users.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, consider applying temporary mitigations such as input validation or output encoding at the application level to reduce XSS risk. Monitor vendor communications for updates.