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CVE-2026-4081

ZeM STL <= 1.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode Attributes

Published: Jun 2, 2026Updated: Jun 2, 2026 Sources: CVE List NVD
NVD MITRE
6.4CVSS
MEDIUM

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:CC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None

Weaknesses

CWE-79

Affected Products

ZeM STL
jhdscript

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://www.wordfence.com/threat-intel/vulnerabilities/id/07e415f9-42f1-4c80-a023-38f460f634d3?source=cve
wordfence.com
https://plugins.trac.wordpress.org/browser/zem-stl-viewer/trunk/zemstl.php#L107
plugins.trac.wordpress.org
https://plugins.trac.wordpress.org/browser/zem-stl-viewer/tags/1.0/zemstl.php#L107
plugins.trac.wordpress.org
and 6 more references View all →

Timeline

Published
Jun 2, 2026
Last Updated
Jun 2, 2026

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