CVE-2026-122220

HighCVSS 7.4/10Last modified Nov 5, 2026

Description

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.

Metrics

CVSS 3.1 7.4/10CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-294

Affected software

Source: the vendor's advisory (CNA). NVD analysis pending.

Vendor	Product	Versions
wpo365	WPO365 \| SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 \| LOGIN)	< 45.2

References

Timeline

Published: Nov 4, 2026
Last modified: Nov 5, 2026
NVD status: Received

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