CVE-2026-8853 MW WP Form <= 5.1.3 - Authenticated (Editor+) Stored Cross-Site Scripting via 'memo' Parameter
Authenticated editors can inject arbitrary scripts via the memo parameter in MW WP Form, leading to stored XSS execution for other users.
- 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-2026-8853?
CVE-2026-8853 is a medium-severity cross-site scripting vulnerability in websoudan MW WP Form, published on 10 Jun 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
The MW WP Form plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'memo' parameter in all versions up to, and including, 5.1.3 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with editor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. Because the memo value is stored via update_post_meta() rather than wp_insert_post(), WordPress's built-in kses and unfiltered_html protections do not apply, allowing attackers to break out of the textarea element via injected closing tags regardless of role-based content filtering.
Weakness: CWE-79
Which versions are affected by CVE-2026-8853?
How do I fix CVE-2026-8853?
No fix has been published for CVE-2026-8853 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-2026-8853 being exploited?
There is no known exploitation of CVE-2026-8853 in the wild and no public exploit code.
Sources
Also known as GHSA-xqph-m7fw-c4rf.