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Jenkins Active Directory Plugin 2.41 and earlier deserializes data obtained through LDAP referrals without validating it. The plugin follows LDAP referrals from the configured Active Directory server by default; an attacker who controls that server, or who can perform a machine-in-the-middle attack on the LDAP connection, can cause the referral target to point to an attacker-controlled RMI URL. When Jenkins processes that referral, the controller may deserialize attacker-controlled data. If suitable deserialization gadget chains are present on the Jenkins controller classpath, this can result in remote code execution on the controller. This issue is tracked as SECURITY-3659 / CVE-2026-48919.
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