Executive brief
Vvveb, an open-source content management system and website builder, is vulnerable to a flaw that can crash the website. By repeatedly accessing restricted administrative pages using a low-level account, an attacker can force the server to exhaust its memory. This results in a denial-of-service, making the website unavailable to legitimate visitors and customers.
Technical details
An uncontrolled recursion vulnerability exists in the Vvveb admin controller dispatch cycle prior to version 1.0.8.3. The root cause is located in the Base::init() function, which repeatedly invokes the permission() method on error handlers when a user attempts to access forbidden URLs. This creates an infinite recursion loop that consumes PHP memory until limits are exhausted. A remote attacker with low-privileged credentials can exploit this by sending sustained requests to restricted admin paths, effectively crashing all PHP worker processes and causing a denial-of-service (DoS). The issue was addressed in version 1.0.8.3 by modifying the Error403 controller to no longer extend the vulnerable Base class.
Affected products
- givanz Vvveb before 1.0.8.3
Timeline
- 2026-05-13: patched: Version 1.0.8.3 released
- 2026-05-14: disclosed: Initial disclosure by VulnCheck
- 2026-05-14: advisory: CVE-2026-41935 published