The WP Ad Guru – Banner ad, Responsive popup, Popup maker, Ad rotator & More WordPress plugin is vulnerable to stored cross-site scripting via the 'page' parameter in versions up to 2.5.4. This vulnerability is due to improper neutralization of input during web page generation, specifically insufficient sanitization and escaping of user-supplied input. An unauthenticated attacker can inject arbitrary web scripts that execute when a user views the injected page, potentially compromising user data or session integrity. The CVSS 3.1 base score is 6.1 (AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N), reflecting network attack vector, low attack complexity, no privileges required, user interaction required, scope changed, and low impact on confidentiality and integrity with no impact on availability.

Successful exploitation allows unauthenticated attackers to inject and execute arbitrary scripts in the context of users visiting the affected pages. This can lead to partial confidentiality and integrity impacts such as theft of user credentials, session tokens, or manipulation of page content. There is no direct impact on availability. No known exploits are reported in the wild.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, users should consider disabling or restricting access to the vulnerable plugin or applying manual input sanitization and output escaping if feasible. Monitor vendor channels for updates and apply patches promptly once released.