Answer in brief
CVE-2026-75807 records a High severity (CVSS 7.5) vulnerability in SAML Single Sign On <= 5.4.6 - Unauthenticated Authentication Bypass via X.509 Certificate Poisoning. The current sources do not mark it as known exploited. The current feed maps cyberlord92/SAML Single Sign On – SSO Login (generic), cyberlord92/SAML Single Sign On – SSO Login (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps cyberlord92/SAML Single Sign On – SSO Login (generic), cyberlord92/SAML Single Sign On – SSO Login (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| cyberlord92/SAML Single Sign On – SSO Logingeneric | 0 | Not reported |
| cyberlord92/SAML Single Sign On – SSO Logingeneric | >=0 <=5.4.6 | Not reported |
Published upstream
Aug 29, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 31, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 29, 2026
The SAML Single Sign On – SSO Login plugin for WordPress is vulnerable to Authentication Bypass in versions up to, and including, 5.4.6. This is due to the mo_saml_login_validate() ACS handler persisting the X.509 certificate extracted from an incoming SAMLResponse into the mo_saml_required_certificate option before the signature-validation verdict is enforced, because mo_saml_find_certificate() returns false on a fingerprint mismatch rather than halting execution. This makes it possible for unauthenticated attackers to overwrite the plugin's stored IdP signing certificate with an attacker-controlled value, and subsequently forge SAML assertions for any WordPress account — including administrators — to obtain a fully privileged session. Note: The exploit requires the administrator to perform a repair after receiving the test_config_error_wpsamlerr004 error message during the test configuration.
Quoted source text, attributed separately from HOL analysis.