CVE-2026-4081: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in jhdscript ZeM STL
The ZeM STL plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the [zemstl] shortcode in all versions up to and including 1.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes, specifically the 'url', 'color', and 'bgcolor' parameters. These attribute values are directly interpolated into HTML attribute context without being passed through esc_attr() or any other escaping function. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
AI Analysis
Technical Summary
The ZeM STL plugin for WordPress suffers from a stored XSS vulnerability due to improper neutralization of input during web page generation. Specifically, the shortcode [zemstl] accepts attributes 'url', 'color', and 'bgcolor' that are directly embedded into HTML attributes without escaping via functions like esc_attr(). This allows authenticated users with Contributor or higher privileges to inject arbitrary JavaScript code that executes in the context of any user viewing the compromised page. The vulnerability is tracked as CVE-2026-4081 with a CVSS 3.1 base score of 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N). No patch or official fix has been published yet.
Potential Impact
Successful exploitation allows an authenticated user with Contributor-level access or above to inject persistent malicious scripts into WordPress pages via the vulnerable shortcode attributes. This can lead to limited confidentiality and integrity impacts, such as session hijacking or content manipulation, but does not affect availability. The vulnerability requires authentication and has low attack complexity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict Contributor-level access to trusted users only and consider disabling or removing the ZeM STL plugin if possible. Monitor for updates from the vendor regarding patches or official mitigations.
CVE-2026-4081: CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in jhdscript ZeM STL
Description
The ZeM STL plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the [zemstl] shortcode in all versions up to and including 1.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes, specifically the 'url', 'color', and 'bgcolor' parameters. These attribute values are directly interpolated into HTML attribute context without being passed through esc_attr() or any other escaping function. This makes it possible for authenticated attackers, with Contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
CVSS v3.1
Score 6.4medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The ZeM STL plugin for WordPress suffers from a stored XSS vulnerability due to improper neutralization of input during web page generation. Specifically, the shortcode [zemstl] accepts attributes 'url', 'color', and 'bgcolor' that are directly embedded into HTML attributes without escaping via functions like esc_attr(). This allows authenticated users with Contributor or higher privileges to inject arbitrary JavaScript code that executes in the context of any user viewing the compromised page. The vulnerability is tracked as CVE-2026-4081 with a CVSS 3.1 base score of 6.4 (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N). No patch or official fix has been published yet.
Potential Impact
Successful exploitation allows an authenticated user with Contributor-level access or above to inject persistent malicious scripts into WordPress pages via the vulnerable shortcode attributes. This can lead to limited confidentiality and integrity impacts, such as session hijacking or content manipulation, but does not affect availability. The vulnerability requires authentication and has low attack complexity.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict Contributor-level access to trusted users only and consider disabling or removing the ZeM STL plugin if possible. Monitor for updates from the vendor regarding patches or official mitigations.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Wordfence
- Date Reserved
- 2026-03-12T20:46:11.094Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a1e9564e29bf47b50adbf2b
Added to database: 6/2/2026, 8:33:40 AM
Last enriched: 6/2/2026, 9:03:51 AM
Last updated: 6/3/2026, 5:02:12 AM
Views: 5
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