What the vulnerability does
01Description
The OAuth Single Sign On – SSO (OAuth Client) plugin for WordPress is vulnerable to authentication bypass in all versions up to, and including, 6.26.3. This is due to insufficient verification on the user being returned by the social login token. This makes it possible for unauthenticated attackers to log in as any existing user on the site, such as an administrator, if they have access to the username and the user does not have an already-existing account for the service returning the token.
Explanation of Vulnerability in Simple Terms
02Summary
The OAuth Single Sign On plugin for WordPress contains an authentication bypass vulnerability affecting versions up to 6.26.3. An attacker can exploit improper authentication logic to gain unauthorized access without valid credentials. The vulnerability requires specific network conditions but does not require user interaction. Sites using this plugin should update immediately to a patched version.
What an attacker can do
03Attacker Capabilities
Bypass authentication and gain unauthorized access to the site without valid credentials.
Potential impact on your site
04Site Impact
Attackers can log in as any user, access sensitive data, modify content, or take full control of the site.
Conditions required to exploit
05Prerequisites
Network access to the site; no user interaction or prior authentication required.
Key dates
06Disclosure timeline
December 12, 2024
CVE published
April 8, 2026
Record updated
