Is CVE-2026-6399 actively exploited?

No active exploitation of CVE-2026-6399 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-6399 be exploited remotely?

Yes. CVE-2026-6399 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-6399?

CVE-2026-6399 has a CVSS score of 4.4 (MEDIUM).

HOME VULNERABILITIESCVE-2026-6399

MEDIUM

CVE-2026-6399

CWE-79Published: May 20, 2026· Updated: May 20, 2026

4.4

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:9.0th

Official Description

The General Options plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to and including 1.1.0. This is due to the use of sanitize_text_field() for output escaping in the Contact Number (ad_contact_number) field — a function that strips HTML tags but does not encode double-quote characters to their HTML entity equivalent ("). When the stored value is echoed inside a double-quoted HTML attribute (value="..."), an attacker-supplied double-quote character breaks out of the attribute context. Even with WordPress's wp_magic_quotes mechanism (which prefixes quotes with a backslash), the resulting \" sequence is NOT treated as an escaped quote by HTML parsers — the backslash is rendered as a literal character and the bare double-quote still closes the attribute. This makes it possible for authenticated attackers with Administrator-level access and above to inject arbitrary web scripts in the admin settings page that will execute whenever any administrator visits the General Options settings page.

NVD Source

Technical Analysis

CVE-2026-6399 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

The vulnerability has a "Changed" scope, meaning successful exploitation can impact components beyond the vulnerable component itself — such as the host operating system or adjacent services.

From a weakness classification perspective (CWE-79): Cross-site scripting (XSS) vulnerabilities allow attackers to inject malicious scripts into web pages viewed by other users.