Security readout for executives and security teams
Plain-English summary
CVE-2026-4022 affects the WordPress plugin Show Posts list – Easy designs, filters and more. A logged-in user with Contributor-level access or higher could save malicious script through a shortcode setting. That script may run when someone views the affected page. This is a site integrity and user-trust risk, but it requires an authenticated account.
Executive priority
Treat as a routine but timely WordPress remediation item. Prioritize sites with many content contributors, external authors, or previously compromised accounts. It is not confirmed as actively exploited in the provided sources, but stored XSS can affect visitors and administrators once malicious content is saved.
Technical view
The issue is stored cross-site scripting in the swiftpost-list shortcode, specifically the post_type attribute. The CVE description attributes it to insufficient input sanitization and output escaping in versions up to and including 1.1.0. CVSS 3.1 is 6.4, with low privileges required, network attack vector, changed scope, and low confidentiality and integrity impact.
Likely exposure
Exposure is limited to WordPress sites using the Show Posts list plugin at versions up to 1.1.0, where untrusted or compromised users have Contributor or higher permissions. Sites without this plugin, without such users, or with the shortcode unused have lower practical exposure.
Exploitation context
The provided sources do not show CISA KEV listing or confirm active exploitation. Abuse requires authenticated WordPress access with Contributor-level privileges or higher and an opportunity to place the affected shortcode in content viewed by others.
Researcher notes
Evidence is strongest for the shortcode attribute handling described by the CVE and Wordfence reference. The bundle cites WordPress Trac source lines for shortcode registration and handling. The sources do not clearly identify a fixed version, so remediation should be verified against vendor or plugin repository guidance.
Mitigation direction
- Check vendor and WordPress plugin guidance for an updated or remediated version.
- If no fix is available, disable or remove the plugin where business impact allows.
- Restrict Contributor and higher accounts to trusted users only.
- Review existing content using the swiftpost-list shortcode.
- Monitor WordPress users and content changes for suspicious activity.
Validation and detection
- Inventory WordPress sites for the show-posts-shortcodes plugin.
- Confirm installed plugin version is not up to and including 1.1.0.
- Identify users with Contributor, Author, Editor, or Administrator roles.
- Search content for use of the swiftpost-list shortcode.
- Review relevant pages for unexpected script execution or unauthorized edits.
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-2026-4022 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/fc6634bc-4427-44b6-bf77-d97d5b49e82f?source=cveCVE reference
- https://plugins.trac.wordpress.org/browser/show-posts-shortcodes/trunk/post-shortcode.php#L119CVE reference
- https://plugins.trac.wordpress.org/browser/show-posts-shortcodes/tags/1.1.0/post-shortcode.php#L119CVE 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.