CVE-2026-11402 is a stored cross-site scripting vulnerability in the Services Section Block – Showcase Service Details in Grid or Columns plugin for WordPress, affecting all versions up to 1.4.4. The vulnerability arises from insufficient input sanitization and output escaping of the 'link' block attribute. Authenticated attackers with contributor-level permissions or higher can inject arbitrary scripts that persist in HTML comments in post_content, bypassing the wp_kses_post sanitization function at save time. The malicious payload executes via both the primary service link anchor and a secondary title-wrapped anchor when the linkIn option is configured to 'title'.

An attacker with contributor-level access or higher can inject persistent malicious scripts into pages, which execute in the context of users viewing those pages. This can lead to information disclosure and limited integrity impact. The vulnerability does not affect availability. The CVSS 3.1 base score is 6.4 (medium severity), reflecting network attack vector, low attack complexity, low privileges required, no user interaction, and impact on confidentiality and integrity with no availability impact.

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 removing the vulnerable plugin. Monitor for updates from the vendor or plugin maintainer regarding patches or mitigations.