Quick answers
- Is CVE-2026-54506 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-54506 being exploited in the wild.
- How severe is CVE-2026-54506?
- High severity, with a CVSS score of 7.6, published 17 September 2026.
- Which products and versions are affected?
- Vvveb prior to 1.0.8.5.
- Is there a fix for CVE-2026-54506?
- A patch was published on 2026-06-07: Fixed in version 1.0.8.5 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-54506 attacked?
- It is attacked over the network, in a web application.
- Am I affected by CVE-2026-54506?
- Check whether you run Vvveb at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
This is a stored cross-site scripting (XSS) vulnerability in Vvveb's user profile bio functionality. The root cause is a flawed sanitizeHTML() function in system/functions.php that uses an incomplete regular expression for filtering event handlers (missing forward-slash delimiter) and compares a string to itself in its do-while condition, causing forbidden nested tags to be stripped only once rather than recursively. An attacker with Author role or higher can submit markup with solidus-prefixed event handlers (e.g., forward-slash-prefixed) or nested forbidden tags that survive this inadequate sanitization. The stored bio is rendered without proper output encoding on /author/{username}, in the admin user-management interface, and potentially in comments, allowing the injected JavaScript to execute in victim browsers. The vulnerability has been patched in version 1.0.8.5.
Affected products
- Vvveb Vvveb prior to 1.0.8.5
Timeline
- 2026-09-17: disclosed
- 2026-06-07: patched: Fixed in version 1.0.8.5