CVE-2026-39918Network attack vector

Unauthenticated code execution via installer subdir injection

Published Apr 20, 2026 · Updated Apr 20, 2026

Code injection in Vvveb before 1.0.8.1 allows remote attackers to execute PHP code through the web-based installation endpoint. The install() method in install/controller/index.php inserts the untrusted subdir value into an env.php define string without escaping or validation. Exploitation requires the installation workflow to be reachable and runs injected code with the web server user's privileges.

CVSS severity9.2
Critical
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Code injection in Vvveb before 1.0.8.1 allows remote attackers to execute PHP code through the web-based installation endpoint. The install() method in install/controller/index.php inserts the untrusted subdir value into an env.php define string without escaping or validation. Exploitation requires the installation workflow to be reachable and runs injected code with the web server user's privileges.

The record

CVE
CVE-2026-39918
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
givanz
Product
Vvveb
Classifications
CWE-94, T1059
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.0.8.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

givanz · Vvvebversion=0 <1.0.8.1

Published CVSS scores

9.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.2VulnCheckCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo