CVE-2026-0557 is a stored cross-site scripting vulnerability in the WP Data Access plugin for WordPress (versions ≤ 5.5.63). The issue is due to improper neutralization of input during web page generation, specifically insufficient sanitization and escaping of attributes passed to the 'wpda_app' shortcode. This allows authenticated users with contributor or higher privileges to inject malicious scripts that execute in the context of other users viewing the injected pages. The vulnerability has a CVSS 3.1 base score of 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N), reflecting network attack vector, low attack complexity, required privileges, no user interaction, scope change, and limited confidentiality and integrity impact without availability impact.

An attacker with contributor-level or higher access can exploit this vulnerability to inject persistent malicious scripts into pages using the 'wpda_app' shortcode. These scripts execute in the browsers of users who visit the affected pages, potentially leading to theft of session tokens, user impersonation, or other actions permitted by the victim's privileges. The vulnerability affects confidentiality and integrity but does not impact availability. There are no known exploits in the wild at this time.

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 'wpda_app' shortcode. Monitor for plugin updates from the vendor and apply them promptly once released.