CVE-2026-1559 is a stored cross-site scripting vulnerability in the Youzify – BuddyPress Community, User Profile, Social Network & Membership Plugin for WordPress. The issue is due to improper neutralization of input in the 'checkin_place_id' parameter, allowing authenticated users with Subscriber-level privileges or higher to inject arbitrary web scripts. These scripts execute when other users access the injected pages, potentially leading to session hijacking or other script-based attacks. The vulnerability affects all versions up to and including 1.3.6. The CVSS 3.1 base score is 6.4, reflecting a network attack vector, low attack complexity, low privileges required, no user interaction, and partial impact on confidentiality and integrity.

An attacker with at least Subscriber-level access can inject persistent malicious scripts into pages viewed by other users, potentially compromising user sessions or data confidentiality and integrity. The vulnerability 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 user privileges to trusted users only and consider disabling or limiting the use of the 'checkin_place_id' parameter if possible. Monitor plugin updates closely for a security patch.