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CVE-2026-42525 is an open redirect vulnerability in the Jenkins Microsoft Entra ID Plugin, previously known as the Azure AD Plugin. Versions 666.v6060de32f87d and earlier do not properly restrict the post-login redirect URL. As a result, an attacker can cause a user to visit a legitimate Jenkins URL that, after successful authentication, redirects the user to an attacker-controlled destination. The flaw is tracked by Jenkins as SECURITY-3760 and is primarily relevant to authentication flows handled by the plugin.
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