CVE-2026-12477 Gravity Booster <= 5.26 - Authenticated (Editor+) Stored Cross-Site Scripting via 'stylerSettings' Parameter
Authenticated editors can inject arbitrary scripts via admin settings in Gravity Booster, affecting multi-site or restricted HTML installations.
- 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-2026-12477?
CVE-2026-12477 is a medium-severity cross-site scripting vulnerability in wpmonks Gravity Booster – Styles & Layouts for Gravity Forms, published on 16 Aug 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
The Gravity Booster – Styles & Layouts for Gravity Forms plugin for WordPress is vulnerable to Stored Cross-Site Scripting via admin settings in all versions up to, and including, 5.26 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with editor-level permissions and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This only affects multi-site installations and installations where unfiltered_html has been disabled.
Weakness: CWE-79
Which versions are affected by CVE-2026-12477?
How do I fix CVE-2026-12477?
No fix has been published for CVE-2026-12477 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-2026-12477 being exploited?
There is no known exploitation of CVE-2026-12477 in the wild and no public exploit code.
Sources
Also known as GHSA-5w9q-5r59-3g9f.