CVE-2026-6399 General Options <= 1.1.0 - Authenticated (Administrator+) Stored Cross-Site Scripting via 'ad_contact_number' Parameter
Administrators can inject scripts via the contact number field, leading to code execution when other admins view settings.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6399?
CVE-2026-6399 is a medium-severity cross-site scripting vulnerability in yog2515 General Options, published on 20 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.
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.
Weakness: CWE-79
Which versions are affected by CVE-2026-6399?
How do I fix CVE-2026-6399?
No fix has been published for CVE-2026-6399 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-6399 being exploited?
There is no known exploitation of CVE-2026-6399 in the wild and no public exploit code.
Sources
Also known as GHSA-3hhp-2p2q-gg5w.