CVE Catalog

CVE-2026-9626

MediumCVSS 6.4
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.23%

14th percentile - higher than 14% of all known CVEs

Summary

The JSON API User plugin for WordPress up to version 4.1.0 is vulnerable to Stored Cross-Site Scripting. An attacker with subscriber-level access or higher can inject malicious scripts via the 'content' parameter of the post_comment API endpoint and self-approve the comment, bypassing moderation.

Risk Assessment

The risk involves arbitrary JavaScript execution in browsers of users visiting the affected page, potentially leading to session hijacking, redirects, or sensitive data theft.

Recommendation

Immediately update the JSON API User plugin to the latest available version that fixes this vulnerability. If an update is not possible, temporarily disable the plugin.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS