RCE in Givanz Vvveb

CVE-2026-39918

Vvveb prior to 1.0.8.1 contains a code injection vulnerability in the installation endpoint where the subdir POST parameter is written unsanitized into the env.php configuration file without escaping or validation. Attackers can inject arbitrary PHP code by breaking out of the string context in the define statement to achieve unauthenticated remote code execution as the web server user.

Vulnerability class: RCE (Remote Code Execution)

Published · last modified .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (66.1th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-39918: held from 0.007 to 0.011.

EPSS over last 30 days · oldest: 0.007 · newest: 0.011 · change: +0.005

Affected products

  • Givanz Vvveb — versions 0, 5162c1639130bd080ab63c7d856788cd59d6b3b7

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-39918?
CVE-2026-39918 is a critical-severity vulnerability in Givanz Vvveb, classified under Code Injection. CVSS score: 9.8/10. Published 2026-04-20.
How severe is CVE-2026-39918?
Critical severity. CVSS v3 base score is 9.8 out of 10.