CVE-2026-121491
Fiber Admin 3.1.0 - 4.0.0 - Unauthenticated RCE via Host Header
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| Vendor | unknown |
| Product | fiber admin |
| Published | Nov 7, 2026 |
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Affected Versions
Unknown / Fiber Admin
3.1.0 < 4.0.1
References
Credits
Naoki Kawahigashi WPScan