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Jenkins Active Directory Plugin 2.41 and earlier follows LDAP referrals from the configured Active Directory server by default. An attacker who controls the configured Active Directory/LDAP server, or who can perform a machine-in-the-middle attack on the LDAP connection, can cause Jenkins to follow a malicious referral to an attacker-controlled endpoint. The advisory specifically notes referral targets such as RMI URLs. In the context of CVE-2026-48918, this behavior results in Jenkins initiating unintended outbound connections, i.e., an SSRF condition. Related advisory material also notes that referral chasing can be chained with deserialization behavior covered separately as CVE-2026-48919.
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Cross-references every affected SKU, including bundled OEM variants.
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