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.

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)

EPSS: 0.007 (49.4th percentile) — read the EPSS interpretation.

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.

Affected products

Givanz Vvveb — versions 0, 5162c1639130bd080ab63c7d856788cd59d6b3b7

Weakness classification (CWE)

CWE-94 — Code Injection

References

disclosure@vulncheck.com (release-notes)
disclosure@vulncheck.com (patch)
disclosure@vulncheck.com (third-party-advisory)

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.