NVD security advisoryCritical
Critical advisory for WPO365 | LOGIN (wpo365-login) plugin bef
CVE-2026-122220 · Reported 4 Nov 2026
Full advisory details, affected packages, severity context, and original source.
Affected technology
WPO365 | LOGIN (wpo365-login) plugin befAffected product
Advisory overview
WPO365 | LOGIN (wpo365-login) plugin before version 45.2 contains an authentication bypass by capture-replay vulnerability caused by a non-functional anti-replay check in Saml2_Service::check_message_id(), which never persists processed SAML message IDs to the wpo365_saml_message_ids transient due to a logic error that returns before saving. Attackers who capture a validly-signed SAMLResponse can replay it to the ACS endpoint repeatedly within its assertion validity window to log in as the victim, including administrators, without detection since the duplicate message ID check never triggers.