PT-2026-26859 · Sherkspear · Sherk Custom Post Type Displays

Youcef Hamdani · Published 2026-03-21 · Updated 2026-03-21 · CVE-2026-3554

NVD

CVSS v3.1

6.4

Medium

AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

The Sherk Custom Post Type Displays plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'title' shortcode attribute in all versions up to, and including, 1.2.1. This is due to insufficient input sanitization and output escaping on the 'title' attribute of the 'sherkcptdisplays' shortcode. Specifically, in the sherkcptdisplays func() function in includes/SherkCPTDisplaysShortcode.php, the 'title' attribute value is extracted from shortcode atts() on line 19 and directly concatenated into an HTML

tag on line 31 without any escaping. 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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-3554

Affected Products

Sherk Custom Post Type Displays

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-3554 · Security Note
• https://plugins.trac.wordpress.org/browser/sherk-custom-post-type-displays/tags/1.2.1/includes/SherkCPTDisplaysShortcode.php#L19 · Note
• https://plugins.trac.wordpress.org/browser/sherk-custom-post-type-displays/trunk/includes/SherkCPTDisplaysShortcode.php#L31 · Note
• https://plugins.trac.wordpress.org/browser/sherk-custom-post-type-displays/tags/1.2.1/includes/SherkCPTDisplaysShortcode.php#L31 · Note
• https://wordfence.com/threat-intel/vulnerabilities/id/d227d4e4-2899-434c-8b93-8d93a89b1b1b?source=cve · Note
• https://plugins.trac.wordpress.org/browser/sherk-custom-post-type-displays/trunk/includes/SherkCPTDisplaysShortcode.php#L19 · Note