CVE-2026-3354
Stored XSS in Wikilookup WordPress Plugin Affects Multi-Site
Publication date: 2026-03-21
Last updated on: 2026-03-21
Assigner: Wordfence
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| wikilookup | plugin | to 1.1.5 (inc) |
Helpful Resources
Exploitability
| 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know
What immediate steps should I take to mitigate this vulnerability?
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.