Sherk Custom Post Type Displays <= 1.2.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'title' Shortcode Attribute

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Summary

CVECVE-2026-3554
StatePUBLISHED
AssignerWordfence
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-21 04:17:29 UTC
Updated2026-04-24 16:27:44 UTC
DescriptionThe 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 <h2> 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.

Risk And Classification

Primary CVSS: v3.1 6.4 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

EPSS: 0.000420000 probability, percentile 0.127370000 (date 2026-04-25)

Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
3.1CNADECLARED6.4MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Sherkspear Sherk Custom Post Type Displays affected 1.2.1 semver Not specified

References

ReferenceSourceLinkTags
www.wordfence.com/threat-intel/vulnerabilities/id/d227d4e4-2899-434c-8b93-8d93a... [email protected] www.wordfence.com
plugins.trac.wordpress.org/browser/sherk-custom-post-type-displays/tags/1.2.1/includes/S... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/sherk-custom-post-type-displays/trunk/includes/SherkC... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/sherk-custom-post-type-displays/trunk/includes/SherkC... [email protected] plugins.trac.wordpress.org
plugins.trac.wordpress.org/browser/sherk-custom-post-type-displays/tags/1.2.1/includes/S... [email protected] plugins.trac.wordpress.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Youcef Hamdani (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-03-20T15:09:43.000ZDisclosed
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