CVE-2026-12281
HighCVSS 8.1Exploitation Probability (EPSS)
Low risk14th percentile - higher than 14% of all known CVEs
Summary
The Shibboleth WordPress plugin before version 2.5.4 does not fail closed when its HTTP header identity mode is enabled without an anti-spoofing key, treating any request carrying identity headers as an authenticated session without verifying them.
Risk Assessment
On a deployment where untrusted client headers reach the application, an unauthenticated attacker can log in with forged identity headers. With automatic account creation and default administrator role mapping enabled, they can create and sign in as a new administrator, gaining full control.
Recommendation
Immediately update the Shibboleth plugin to version 2.5.4 or later. Additionally, configure an anti-spoofing key for the HTTP header mode and ensure untrusted client headers are stripped before reaching the application.
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Original NVD description (English source)
The Shibboleth WordPress plugin before 2.5.4 does not fail closed when its HTTP header identity mode is enabled without an anti-spoofing key, treating any request that carries identity headers as an authenticated session without verifying them. On a deployment where untrusted client headers reach the application, an unauthenticated attacker can log in with forged identity headers and, when automatic account creation and the default administrator role mapping are enabled, create and sign in as a new administrator. Exploitation requires the non-default HTTP header attribute mode, an empty or absent spoof key, automatic account creation enabled, and a deployment that does not strip untrusted client headers before they reach the application.