Vvveb CMS CVE-2026-41934

Exploitation requires authenticated access with editor, author, contributor, or site_admin role privileges in Vvveb CMS (CVSS PR:L). The target installation must be running on Apache HTTP Server with .htaccess override enabled (AllowOverride All or AllowOverride FileInfo directive in Apache configuration) - deployments using nginx or with .htaccess disabled are not vulnerable. The admin code editor feature must be accessible to the attacker's role, which is the default configuration for the specified roles in Vvveb versions before 1.0.8.2. No user interaction required (UI:N) beyond the attacker's authenticated session. Network accessibility to the admin interface (AV:N) is required, but exploitation from low-privilege internal accounts is also viable. The vulnerability does not require specific PHP configuration or non-default Vvveb settings. Key limiting factors: authenticated access requirement blocks opportunistic mass scanning, and the Apache/.htaccess dependency narrows the attack surface to specific web server configurations, excluding nginx and Apache installations with strict AllowOverride policies.

Real-world risk is HIGH despite the PR:L authentication requirement. The CVSS 4.0 score of 8.7 with vector AV:N/AC:L/PR:L/UI:N reflects network-accessible exploitation with low complexity and no user interaction once an attacker has low-privilege credentials. The vulnerability is particularly dangerous because it enables privilege escalation from content editor roles (commonly granted to non-administrative users in CMS deployments) to full remote code execution with web server privileges. The two-stage attack (htaccess upload then PHP upload) is well-documented in web application security and easily automatable once initial access is obtained. EPSS data not provided, but the combination of low attack complexity, common deployment scenario (PHP/Apache environments), and privilege escalation potential suggests moderate to high likelihood of exploitation if credentials are compromised via phishing, credential stuffing, or insider threat. No KEV listing indicates no confirmed widespread exploitation, and no POC availability mentioned reduces immediate weaponization risk. However, the detailed CVE description and GitHub advisory provide sufficient technical detail for adversaries to develop exploits. Primary mitigating factors: requires authenticated access (blocks opportunistic scanning) and affects only Apache-based deployments with .htaccess override enabled (AllowOverride directive). Organizations using nginx or with .htaccess disabled are not vulnerable. The availability of vendor patch 1.0.8.2 since the advisory date provides clear remediation path. This should be prioritized for Vvveb installations with multiple user roles or untrusted content contributors, especially in shared hosting or multi-tenant environments.

An attacker with compromised contributor-level credentials (obtained via phishing or password reuse) logs into the Vvveb admin panel and navigates to the code editor feature. They create a new file named .htaccess containing 'AddHandler application/x-httpd-php .jpg' to instruct Apache to treat .jpg files as executable PHP. Next, they upload a malicious PHP webshell disguised as image.jpg containing code execution functions. When the attacker accesses https://victim-site.com/path/to/image.jpg via HTTP request, Apache executes the PHP code with web server privileges, granting the attacker a persistent backdoor for data exfiltration, lateral movement, or complete site defacement without further authentication required.