JSON API User <= 4.1.0 - Authenticated (Subscriber+) Stored Cross-Site Scripting via 'content' Parameter

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6.4
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE CVE-2026-9626
CVSS 6.4 (Medium)
Publicly Published July 2, 2026
Last Updated July 3, 2026
Researcher Yat

Description

The JSON API User plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'content' parameter of the post_comment API endpoint in versions up to, and including, 4.1.0 This is due to insufficient input sanitization in the post_comment() function, which passes the attacker-controlled comment_content value directly to wp_insert_comment() without applying any HTML sanitization, and additionally allows the caller to set comment_approved=1 to self-approve the comment and bypass moderation. This makes it possible for authenticated attackers, with subscriber-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Learn more about Cross-Site Scripting vulnerabilities and how to prevent them.

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Vulnerability Details for JSON API User

JSON API User

Software Type Plugin
Software Slug json-api-user (view on wordpress.org)
Patched? Yes
Remediation Update to version 4.1.2, or a newer patched version
Affected Version
  • <= 4.1.0
Patched Version
  • 4.1.2

Recent vulnerabilities in JSON API User

JSON API User <= 3.9.3 - Unauthenticated Privilege Escalation
9.8
CVE-2024-6624
Jul 10, 2024
Researcher: Thanh Nam Tran
# Title CVE ID CVSS Researchers Date
1 JSON API User <= 3.9.3 - Unauthenticated Privilege Escalation CVE-2024-6624 9.8 Thanh Nam Tran July 10, 2024
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