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 arb…

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.003 (54.7th 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

github.com/givanz/Vvveb/releases/tag/1.0.8.1 (release-notes)
github.com/givanz/Vvveb/commit/5162c1639130bd080ab63c7d856788cd59d6b3b7 (patch)
www.vulncheck.com/advisories/vvveb-code-injection-via-installation-endpoint (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.