Security Alert Summary
The Contextual Related Posts plugin for WordPress contains a stored Cross-Site Scripting (XSS) vulnerability via the other_attributes parameter. Authenticated attackers with contributor-level access or higher can inject scripts that are stored and executed when an injected page is viewed.
CVE Details
- CVE ID: CVE-2026-2986
- Affected component: Contextual Related Posts plugin for WordPress
- Affected versions: versions up to, and including, 4.2.1
- Published: April 18, 2026 at 12:16:11 PM UTC
- Last modified: April 18, 2026 at 12:16:11 PM UTC
- CVSS v3.1: Base Score 6.4 (MEDIUM) – Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
- Authentication / Privileges / User Interaction: Privileges Required: LOW; User Interaction: NONE; Attack Vector: NETWORK
- Impact: Confidentiality: LOW; Integrity: LOW; Availability: NONE
- CWE: CWE-79
Technical Details
The vulnerability is a stored Cross-Site Scripting (XSS) issue caused by insufficient input sanitization and output escaping of the other_attributes parameter. The plugin stores attacker-supplied input for this parameter and later renders it without adequate escaping, allowing script execution in the browsers of users who view the injected content.
The public description identifies the affected parameter and the required attacker privileges (contributor-level and above). No specific internal functions or REST API endpoints are named in the provided data.
The practical impact of this stored XSS is the execution of attacker-controlled script in the context of visitors’ browsers, which can affect confidentiality and integrity of client-side interactions. The available information does not indicate direct impact to server availability.
How This Could Impact Your Website
On a site with multiple users, an external contractor or a contributor could submit content that includes a crafted other_attributes value. Once stored, that content could be viewed by internal editors, administrators, or site visitors, causing the embedded script to run in their browsers.
Consequences could include disclosure of client-side information accessible to the browser, manipulation of displayed content, or actions that increase the risk of targeted phishing or social engineering against staff or users. The CVSS metrics indicate there is potential for confidentiality and integrity impacts but not for availability loss.
If you’re unsure whether your site is affected or how to assess your current user roles and plugins, it may be worth having a professional review.
Recommended Actions
- Update the affected plugin as soon as a patched version is available.
- Review and reduce unnecessary user roles, especially contributors.
- Enforce strong passwords and two-factor authentication for editors and administrators.
- Remove unused or unmaintained plugins.
- Monitor site activity and logs for unusual behavior, especially content changes from lower-privileged accounts.
If you’d like help reviewing your plugins, user roles, or overall WordPress security posture, our team at Freshy is happy to help.
