Security readout for executives and security teams
Plain-English summary
CVE-2026-3554 affects the Sherk Custom Post Type Displays WordPress plugin through version 1.2.1. A logged-in user with Contributor-level access or higher could store malicious script in a shortcode title attribute. That script may run when someone views the affected page, creating risk to site users and administrators.
Executive priority
Treat as a moderate WordPress content-integrity risk. Prioritize sites with multiple content contributors, public registration, agencies, or shared editorial access. It is less urgent than unauthenticated remote code execution, but it can affect administrator sessions and site visitor trust if abused.
Technical view
The flaw is stored cross-site scripting in the `sherkcptdisplays` shortcode `title` attribute. The CVE description states the value is read with `shortcode_atts()` and concatenated into an HTML `h2` element without sufficient sanitization or output escaping. CVSS is 6.4, vector AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.
Likely exposure
Exposure is limited to WordPress sites using Sherk Custom Post Type Displays version 1.2.1 or earlier, where untrusted or lower-privileged users have Contributor-level access or above. Public anonymous exploitation is not indicated by the provided sources.
Exploitation context
The attacker must be authenticated with Contributor or higher privileges. The issue is stored, meaning the script can persist in content and execute for later visitors. The provided data does not show CISA KEV listing or other cited evidence of active exploitation.
Researcher notes
Evidence points to missing escaping at shortcode output, specifically around `includes/SherkCPTDisplaysShortcode.php` lines 19 and 31 in trunk and tag 1.2.1. No fixed version or vendor remediation is identified in the provided bundle, so remediation status should be verified from current vendor sources.
Mitigation direction
- Identify WordPress sites using Sherk Custom Post Type Displays through version 1.2.1.
- Check the plugin vendor or WordPress plugin page for updated guidance or a fixed release.
- Disable or remove the plugin if it is not required.
- Restrict Contributor-level access to trusted users only.
- Review existing shortcode usage for unexpected or suspicious title values.
Validation and detection
- Confirm the plugin is installed and determine its version.
- Inventory users with Contributor, Author, Editor, or Administrator roles.
- Review pages and posts using the `sherkcptdisplays` shortcode.
- Inspect shortcode `title` attributes for unexpected script-like content.
- Verify any vendor update or compensating control in a staging environment first.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-79: User-session and phishing behavior lookup
Client-side and session-facing weaknesses should be reviewed alongside initial-access and user-execution behaviors. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2026-3554 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.4 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N3.12.7Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.4MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/d227d4e4-2899-434c-8b93-8d93a89b1b1b?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/sherk-custom-post-type-displays/trunk/includes/SherkCPTDisplaysShortcode.php#L31CVE reference
- https://plugins.trac.wordpress.org/browser/sherk-custom-post-type-displays/tags/1.2.1/includes/SherkCPTDisplaysShortcode.php#L31CVE reference
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.