CVE-2026-15739 is a stored cross-site scripting vulnerability (CWE-79) in the Rich Showcase for Google Reviews WordPress plugin by widgetpack. The flaw arises from insufficient input sanitization and output escaping of the 'pagination' shortcode attribute, allowing authenticated users with contributor-level privileges or higher to inject arbitrary web scripts. These scripts execute in the context of any user viewing the compromised page, potentially leading to information disclosure or session hijacking. The vulnerability affects all versions up to and including 6.9.9. No official patch or remediation guidance has been provided as of the publication date.

An attacker with contributor-level access or higher can exploit this vulnerability to inject malicious scripts that execute in the browsers of users who view the infected pages. This can lead to limited confidentiality and integrity impacts, such as theft of user session data or manipulation of page content. There is no direct impact on availability. The vulnerability requires authenticated access and does not involve user interaction beyond viewing the affected page.

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 removing or disabling the 'pagination' shortcode if feasible. Monitor for updates from the vendor or plugin maintainers regarding patches or official mitigations.