CVE-2026-104803 WPCOM Member - Authentication Bypass

WPCOM Member plugin for WordPress <= 1.7.27 contains an authentication bypass caused by missing nonce validation and OAuth state verification in social-login callback, letting unauthenticated attackers log in as any user with known social provider ID, exploit requires configured social provider and knowledge of victim's openid or unionid.

CVSS base score 9.8 /10
Critical
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
EPSS
0.45% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
10 October 2026
Updated
15 October 2026
Weakness
CWE-287

Vendor fix

Update to the latest version beyond 1.7.27.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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