CVE-2026-121491 Fiber Admin 3.1.0 - 4.0.0 - Unauthenticated RCE via Host Header
CriticalCVSS 9.0
EPSS 0.40%
- Published
- Updated
- Exploit status
- No public exploit known
Description
The Fiber Admin WordPress plugin before 4.0.1 does not validate or escape a request header before writing it into a PHP file it regenerates on an unprotected admin hook, allowing unauthenticated attackers to execute arbitrary code when its custom database error page is enabled and they win a race against an administrator saving its settings.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| wordpress fiber-admin(WordPress) | >= 3.1.0, < 4.0.1 | 4.0.1 |
References
- wpscan.com exploit technical-description vdb-entry
- Wordfence Intelligence third-party-advisory
- www.cve.org