CVE-2025-11834 is a stored cross-site scripting vulnerability in the WP AD Gallery plugin for WordPress, affecting all versions up to and including 1.3. The issue is caused by improper neutralization of input in the 'startindex' parameter of the ad-gallery shortcode, allowing authenticated users with contributor or higher privileges to inject arbitrary web scripts. These scripts execute in the context of any user who accesses the injected page, potentially leading to session hijacking or other script-based attacks. The vulnerability has a CVSS 3.1 score of 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. No known exploits in the wild have been reported, and no patch or official remediation guidance is currently provided.

An attacker with contributor-level access or higher can exploit this vulnerability to inject persistent malicious scripts into pages generated by the WP AD Gallery plugin. These scripts execute in the browsers of users who visit the affected pages, potentially compromising user sessions or data confidentiality and integrity. The vulnerability does not affect availability. No known active exploitation has been reported.

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 WP AD Gallery plugin if possible to mitigate risk.