WordPress Plugin Vulnerabilities
Fiber Admin 3.1.0 - 4.0.0 - Unauthenticated RCE via Host Header
Description
The plugin 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.
Proof of Concept
Affects Plugins
Fixed in 4.0.1 References
CVE
Classification
Type
RCE
OWASP top 10
CWE
CVSS
Miscellaneous
Original Researcher
Naoki Kawahigashi
Submitter
Naoki Kawahigashi
Verified
Yes
WPVDB ID
Timeline
Publicly Published
2026-11-05 (about 2 days ago)
Added
2026-11-05 (about 1 day ago)
Last Updated
2026-11-06 (about 7 hours ago)
