CVE-2026-55230 Vvveb: Stored XSS in Vvveb via sanitizeHTML() filter bypass using a quoted greater-than character
Stored XSS in Vvveb CMS allows low-privilege authors to execute JavaScript in admin browsers, potentially leading to account takeover.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-55230?
CVE-2026-55230 is a high-severity cross-site scripting vulnerability in givanz Vvveb, published on 1 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Vvveb is a powerful and easy to use CMS with page builder to build websites, blogs or ecommerce stores. Prior to version 1.0.8.6, Vvveb's HTML sanitizer fails to strip event-handler attributes when a tag carries a greater-than character inside a quoted attribute value. A low-privilege content author (default role author or contributor) can store a payload in post or product content that runs JavaScript in a browser of every visitor and of any administrator who views or previews that content, which opens a path to admin account takeover. This issue has been patched in version 1.0.8.6.
Weakness: CWE-79
Which versions are affected by CVE-2026-55230?
How do I fix CVE-2026-55230?
No fix has been published for CVE-2026-55230 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-2026-55230 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-55230 exists.
Sources
Also known as GHSA-97xr-82vc-wj2v.