CVE-2024-11878 is a stored cross-site scripting vulnerability in the Category Post Slider WordPress plugin by gbsdeveloper. The flaw exists in the handling of the 'category-post-slider' shortcode, where user-supplied attributes are not properly sanitized or escaped before output. This allows authenticated users with contributor-level permissions or higher to inject arbitrary JavaScript code that executes in the context of other users viewing the affected pages. The vulnerability affects all versions up to and including 1.4. The CVSS 3.1 base score is 6.4, reflecting network attack vector, low attack complexity, required privileges at the contributor level, no user interaction, and impacts on confidentiality and integrity with no availability impact.

An attacker with contributor-level access can inject persistent malicious scripts into pages using the vulnerable shortcode. These scripts execute in the browsers of users who view the infected pages, potentially leading to unauthorized actions or data disclosure within the context of the affected WordPress site. The impact is limited to confidentiality and integrity but does not affect availability. There are no reports of active exploitation in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict contributor-level access to trusted users only and consider disabling or removing the Category Post Slider plugin if possible. Monitor official channels from gbsdeveloper for updates or patches addressing this vulnerability.