EUVD-2026-33885
GHSA-x84m-mwh2-95qm
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Lifecycle Timeline
2DescriptionCVE.org
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.
AnalysisAI
Stored Cross-Site Scripting in the ZeM STL WordPress plugin (all versions through 1.0) allows authenticated contributors to plant persistent malicious scripts in page content via unsanitized [zemstl] shortcode attributes. Wordfence confirmed that the 'url', 'color', and 'bgcolor' shortcode parameters are directly interpolated into HTML attribute context within zemstl.php without passing through WordPress's esc_attr() or any equivalent escaping function, as evidenced by references to the vulnerable source lines (L74, L103, L104, L107). Any site visitor who loads a page containing the injected shortcode will silently execute the attacker's script, enabling session hijacking, credential theft, or privilege escalation against higher-privileged users including administrators. No public exploit code has been identified and this CVE is not listed in CISA KEV at time of analysis.
Technical ContextAI
The affected product is identified by CPE cpe:2.3:a:jhdscript:zem_stl:*:*:*:*:*:*:*:* - the ZeM STL Viewer plugin (vendor: jhdscript) for WordPress, covering all versions through 1.0. The plugin provides a [zemstl] shortcode for embedding STL 3D model viewers in WordPress pages. The root cause is CWE-79 (Improper Neutralization of Input During Web Page Generation), specifically an output escaping omission: attribute values supplied by the shortcode author ('url', 'color', 'bgcolor') are concatenated directly into HTML attribute contexts in zemstl.php at lines 74, 103, 104, and 107 without invoking WordPress's esc_attr() function or any equivalent sanitization. In the WordPress shortcode architecture, any user with the capability to insert shortcodes into content (Contributor and above by default) can supply arbitrary string values for these attributes. The CVSS scope value of S:C (Changed) confirms the vulnerability crosses security boundaries - from the plugin component into the victim's browser session, where the injected script inherits the victim's authentication context.
RemediationAI
No vendor-released patch has been identified at time of analysis - the available references point to the vulnerable source code rather than a corrected version, and no fixed release tag is present in the WordPress plugin repository trac references provided. Until an official patch is released, the primary mitigation is to deactivate and remove the ZeM STL Viewer plugin from affected WordPress installations, which eliminates the attack surface entirely with no functional trade-off beyond losing the 3D STL viewer capability. If plugin removal is not feasible, restrict the Contributor role assignment to trusted users only, as this reduces the pool of potential attackers; note this is an administrative control and does not fix the underlying code flaw. Site operators should monitor the Wordfence advisory page (https://www.wordfence.com/threat-intel/vulnerabilities/id/07e415f9-42f1-4c80-a023-38f460f634d3) and the WordPress plugin repository for the release of a patched version, which should apply esc_attr() to the 'url', 'color', and 'bgcolor' shortcode attribute values in zemstl.php at lines 74, 103, 104, and 107.
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External POC / Exploit Code
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