parorrey JSON API User Plugin up to 4.1.0 on WordPress post_comment content cross site scripting

Summaryinfo

A vulnerability has been found in parorrey JSON API User Plugin up to 4.1.0 on WordPress and classified as problematic. Affected by this vulnerability is the function post_comment of the component JSON API. This manipulation of the argument content causes cross site scripting. This vulnerability is tracked as CVE-2026-9626. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability classified as problematic was found in parorrey JSON API User Plugin up to 4.1.0 on WordPress. Affected by this vulnerability is the function post_comment of the component JSON API. The manipulation of the argument content with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect integrity. The summary by CVE is:

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.

The weakness was disclosed by Yat. The advisory is shared at wordfence.com. This vulnerability is known as CVE-2026-9626 since 05/26/2026. The exploitation appears to be easy. The attack can be launched remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-41490). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• WordPress Plugin

Vendor

• parorrey

Name

• JSON API User Plugin

Version

• 4.0
• 4.1.0

CPE 2.3info

• 🔒
• 🔒

CPE 2.2info

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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