CVE-2026-3354
Received Received - Intake
Stored XSS in Wikilookup WordPress Plugin Affects Multi-Site

Publication date: 2026-03-21

Last updated on: 2026-03-21

Assigner: Wordfence

Description
The Wikilookup plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'Popup Width' setting in all versions up to, and including, 1.1.5. This is due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with Administrator-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
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Meta Information
Published
2026-03-21
Last Modified
2026-03-21
Generated
2026-06-16
AI Q&A
2026-03-21
EPSS Evaluated
2026-06-14
NVD
CVE-2026-3354
EUVD
EUVD-2026-14156
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
wikilookup plugin to 1.1.5 (inc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
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Executive Summary

The Wikilookup plugin for WordPress has a Stored Cross-Site Scripting (XSS) vulnerability in the 'Popup Width' setting in all versions up to and including 1.1.5. This vulnerability exists because the plugin does not properly sanitize or escape input and output data. As a result, authenticated users with Administrator-level access or higher can inject malicious web scripts into pages. These scripts will execute whenever any user accesses the affected page.

This vulnerability specifically affects multi-site WordPress installations or installations where the unfiltered_html capability has been disabled.

Impact Analysis

This vulnerability can allow attackers with administrator privileges to inject malicious scripts into web pages. These scripts can execute in the browsers of users who visit the infected pages, potentially leading to unauthorized actions such as stealing session cookies, defacing the website, or redirecting users to malicious sites.

Because the vulnerability requires high-level access and affects multi-site or restricted HTML installations, the risk is somewhat limited to environments with these configurations.

Compliance Impact

I don't know

Detection Guidance

I don't know

Mitigation Strategies

To mitigate this vulnerability, ensure that you update the Wikilookup plugin for WordPress to a version later than 1.1.5 where the issue is fixed.

Additionally, restrict Administrator-level access to trusted users only, as exploitation requires authenticated users with such privileges.

If possible, review and adjust settings related to 'Popup Width' to avoid injecting malicious scripts.

Also, consider enabling unfiltered_html if your installation allows it, or review multi-site configurations since the vulnerability affects multi-site installations and those with unfiltered_html disabled.

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