Security Alert Summary
The WP Nano AD plugin for WordPress is affected by a stored Cross-Site Scripting (XSS) vulnerability via the ‘blogrole_link’ parameter. Authenticated attackers with administrator-level access can inject arbitrary web scripts that will execute when other users view an injected page. This issue affects multi-site installations and sites where unfiltered_html has been disabled.
CVE Details
- CVE ID: CVE-2025-5085
- Affected component: WP Nano AD plugin for WordPress
- Affected versions: All versions up to and including 1.31
- Published: June 2, 2026 at 9:16:15 AM
- Last modified: June 2, 2026 at 1:03:31 PM
- CVSS v3.1: Base Score 5.5, Medium — Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:L/I:L/A:N
- Authentication / Privileges / User Interaction: Requires authenticated attacker with high privileges (administrator-level). User interaction is not required.
- Primary impact: Confidentiality: Low; Integrity: Low; Availability: None
- Weakness (CWE): CWE-79 (Improper Neutralization of Input During Web Page Generation – Cross-site Scripting)
Technical Details
The vulnerability is a stored Cross-Site Scripting (XSS) flaw that arises from insufficient input sanitization and output escaping of the blogrole_link parameter. In affected versions (up to and including 1.31), an authenticated attacker with administrator-level access can inject malicious script content into pages. Because the injected content is stored and later rendered to other users, the script executes whenever a user views the affected page.
This issue is limited to multi-site installations and to sites where the unfiltered_html capability has been disabled; these conditions affect the contexts in which untrusted HTML might be retained and later rendered. The underlying cause is improper handling of user-supplied input for the named parameter, leading to stored script content being output without adequate escaping.
How This Could Impact Your Website
On a site with multiple users, consider these realistic roles: a site owner who manages the network, internal staff who edit content, and an external contractor who contributes links or ads. If an attacker with administrator-level privileges injects a script via the vulnerable parameter, that script will run in the browsers of other users who visit the injected page. Practical consequences include exposure of information available in the user’s browser context and actions performed on behalf of that user while their session is active.
Potential real-world effects are increased exposure of internal user email addresses and a greater risk of targeted phishing or social engineering against staff or contractors who access the affected pages. If youre unsure whether your site is affected or how to assess your current user roles and plugins, it may be worth having a professional review your setup.
Recommended Actions
- Update the affected plugin as soon as a patched version is available.
- Review and reduce unnecessary user roles and privileges, especially for contributor and editor accounts.
- Enforce strong passwords and enable two-factor authentication for editors and administrators.
- Remove unused or unmaintained plugins to reduce attack surface.
- Monitor site activity and logs for unusual behavior, especially changes to stored content or link entries.
If youd like help reviewing your plugins, user roles, or overall WordPress security posture, our team at Freshy is happy to help.
