CVE-2026-54506
High · CVSS 7.6Published 2026-09-17
CVSS
7.6
High
EPSS
—
exploit probability
Active Exploit
No
not yet listed
What is CVE-2026-54506?
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.
CVSS Score Explained
CVSS 7.6 is High severity. Exploitation is likely straightforward and the impact is significant — data loss, privilege escalation, or remote code execution are common outcomes. Patch as soon as possible.
EPSS Exploitation Probability
No EPSS score yet — model needs more data on this CVE.
References & Patches
- ›https://github.com/givanz/Vvveb/commit/20a01ef08559ffdc97205edeecde86c8ea27e567
- PATCHhttps://github.com/givanz/Vvveb/releases/tag/1.0.8.5
- ›https://github.com/givanz/Vvveb/security/advisories/GHSA-5cg7-phhv-4qjr
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