CVE-2025-13898
BaseFortify
Publication date: 2025-12-06
Last updated on: 2025-12-08
Assigner: Wordfence
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| khurshid_alam_mojumder | ultra_skype_button | 1.0 |
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?
This vulnerability is a Stored Cross-Site Scripting (XSS) issue in the Ultra Skype Button plugin for WordPress. It occurs via the 'btn_id' parameter of the [ultra_skype] shortcode in all versions up to and including 1.0. Due to insufficient input sanitization and output escaping, authenticated users with Contributor-level access or higher can inject malicious scripts into pages. These scripts execute whenever any user accesses the infected page.
How can this vulnerability impact me? :
The vulnerability allows attackers with Contributor-level access or higher to inject arbitrary web scripts that execute in the context of users visiting the affected pages. This can lead to theft of user credentials, session hijacking, defacement, or other malicious actions performed on behalf of the user without their consent.
How can this vulnerability be detected on my network or system? Can you suggest some commands?
This vulnerability can be detected by inspecting WordPress sites using the Ultra Skype Button plugin version 1.0 or earlier. Specifically, look for usage of the [ultra_skype] shortcode with the 'btn_id' parameter containing suspicious or script-like content. Since the vulnerability involves stored Cross-Site Scripting via the 'btn_id' parameter, you can search the WordPress database for posts or pages containing the shortcode with potentially malicious input. For example, you can run a SQL query on the WordPress database to find instances of the shortcode with suspicious 'btn_id' values: SELECT * FROM wp_posts WHERE post_content LIKE '%[ultra_skype%btn_id=%'; Additionally, monitoring HTTP traffic for unusual script injections in pages that include the Skype button may help detect exploitation. There are no specific commands provided in the resources, but these general approaches can be used. [1]
What immediate steps should I take to mitigate this vulnerability?
Immediate mitigation steps include: 1) Restricting Contributor-level and above users from inserting or editing the [ultra_skype] shortcode with untrusted input, especially the 'btn_id' parameter. 2) Removing or disabling the Ultra Skype Button plugin version 1.0 or earlier until a patched version is available. 3) Sanitizing and validating all shortcode attributes before saving or rendering them, if you have the capability to modify the plugin code. 4) Educating users with Contributor-level access about the risk of injecting scripts via shortcode parameters. Since the vulnerability arises from insufficient input sanitization and output escaping, avoiding use of the vulnerable plugin version or restricting access are key immediate steps. [1]