CVE-2026-84151 The Post Grid < 7.9.5 - Contributor+ Stored HTML/iframe Injection via wp_kses_post Allow-List Widening
Contributors can inject malicious HTML and iframes via a widened allow-list, enabling phishing and defacement against visitors and admins.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-84151?
CVE-2026-84151 is a low-severity cross-site scripting vulnerability in Unknown The Post Grid, published on 24 Sep 2026. An attacker needs administrator access to exploit it, and only if a user opens a file or follows a link.
Official description
The Post Grid WordPress plugin before 7.9.5 does not limit an expansion of the WordPress allowed-HTML list to its own markup and applies it site-wide, allowing users with the Contributor role and above to store iframe, style and input elements that are normally stripped from their content, leading to HTML injection (phishing frames, CSS defacement and spoofed input forms) that renders to any visitor and to administrators reviewing the content.
Weakness: CWE-79
Which versions are affected by CVE-2026-84151?
How do I fix CVE-2026-84151?
No fix has been published for CVE-2026-84151 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-2026-84151 being exploited?
There is no known exploitation of CVE-2026-84151 in the wild and no public exploit code.
Sources
Also known as GHSA-93v8-jc63-2mm4.