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Description

Vvveb CMS v1.0.8 contains a remote code execution vulnerability in its media management functionality where a missing return statement in the file rename handler allows authenticated attackers to rename files to blocked extensions .php or .htaccess. Attackers can exploit this logic flaw by first uploading a text file and renaming it to .htaccess to inject Apache directives that register PHP-executable MIME types, then uploading another file and renaming it to .php to execute arbitrary operating system commands as the www-data user.

PUBLISHED Reserved 2026-04-13 | Published 2026-04-20 | Updated 2026-04-21 | Assigner VulnCheck




CRITICAL: 9.2CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:H/SA:N

CRITICAL: 9.1CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Problem types

CWE-434 Unrestricted Upload of File with Dangerous Type

Product status

Default status
unaffected

1.0.8 (semver)
affected

Credits

Mohammed EL OUARDANI finder

References

github.com/...ommit/6fb8eaa998265e33e8802cbc220d8859dbc144f2 (Patch Commit)

www.vulncheck.com/...ote-code-execution-via-media-management third-party-advisory

cve.org (CVE-2026-6257)

nvd.nist.gov (CVE-2026-6257)

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