CVE-2025-10139 is a stored cross-site scripting vulnerability in the WP BookWidgets plugin for WordPress, affecting all versions up to and including 0.9. The issue arises from improper input sanitization and output escaping of user-supplied attributes in the 'bw_link' shortcode. This allows authenticated users with contributor-level permissions or higher to inject arbitrary web scripts that execute when other users access the compromised pages. The vulnerability has a CVSS 3.1 base score of 6.4, reflecting a network attack vector with low complexity, requiring privileges, no user interaction, and impacts confidentiality and integrity with no availability impact.

An attacker with contributor-level access or higher can inject persistent malicious scripts into pages via the vulnerable shortcode. These scripts execute in the context of users viewing the page, potentially leading to unauthorized actions or data exposure limited to confidentiality and integrity impacts. There is no indication of availability impact or 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 released, restrict contributor-level access to trusted users only and consider disabling or removing the WP BookWidgets plugin if possible to prevent exploitation.