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CVE-2026-122220— WPO365 LOGIN before 45.2 SAML Replay Protection Bypass

Quick assessment

Affected
wpo365 WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN)
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WPO365

CVSS 7.4 · High
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I. Basic Information for CVE-2026-122220

Vulnerability Information
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Vulnerability Title
WPO365 LOGIN before 45.2 SAML Replay Protection Bypass
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用捕获-重放进行的认证绕过
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
wpo365 WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) 0 ~ 45.2 -

II. Public POCs for CVE-2026-122220

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-122220

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Other References for CVE-2026-122220 (3)

IV. Related Vulnerabilities

Same product: WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN)
Same vendor: wpo365
Same weakness: CWE-294