CVE-2026-2387 is a stored cross-site scripting vulnerability in the Event Organiser WordPress plugin by stephenharris. The vulnerability arises from improper neutralization of input in the 'eo_events' shortcode's 'no_events' content, which is rendered in event list templates without escaping. This allows authenticated attackers with Contributor-level or higher privileges to inject arbitrary JavaScript that executes in the context of users viewing the injected pages. The CVSS 3.1 base score is 6.4, reflecting a medium severity with network attack vector, low attack complexity, and privileges required at the contributor level. The vulnerability affects all versions up to and including 3.12.9. No official patch or remediation level has been published as of the data provided.

Successful exploitation allows an authenticated user with Contributor-level access or higher to inject persistent malicious scripts into event pages. These scripts execute in the browsers of users who view the affected pages, potentially leading to session hijacking, unauthorized actions, or data theft within the context of the affected WordPress site. The vulnerability does not impact availability but compromises confidentiality and integrity.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, restrict Contributor-level access to trusted users only and consider disabling or limiting use of the 'eo_events' shortcode with untrusted input. Monitor for updates from the plugin vendor for an official fix or temporary mitigation.