Vulnerability · Published Apr 20, 2026 · Assigned by VulnCheck

CVE-2026-39918Vvveb < 1.0.8.1 Code Injection via Installation Endpoint

Critical 9.8

In plain English

A critical-severity code injection in Vvveb from givanz. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 52% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.7%top 48.0% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
givanz	Vvveb	0 – before 1.0.8.1

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

https://github.com/givanz/Vvveb/releases/tag/1.0.8.1 release-notes
https://github.com/givanz/Vvveb/commit/5162c1639130bd080ab63c7d856788cd59d6b3b7 patch
https://www.vulncheck.com/advisories/vvveb-code-injection-via-installation-endpoint third-party-advisory