Jenkins Crafted Existing User Session Improper Authorization Vulnerability [CVE-2019-1003003]

CVE Number – CVE-2019-1003003

A vulnerability in Jenkins could allow an authenticated, remote attacker to gain unauthorized access to a targeted system. The vulnerability is due to the affected software improperly authorizing existing user sessions. An attacker could exploit this vulnerability by using a crafted Remember me cookie on a targeted system. A successful exploit could allow the attacker to gain unauthorized access to an existing user session and conduct further attacks.Jenkins has confirmed the vulnerability and released software updates.


  • To exploit this vulnerability, the attacker must have Overall/RunScripts permissions for the Jenkins application on the targeted system. This access requirement could reduce the likelihood of a successful exploit.


  • Administrators are advised to apply the appropriate updates.Administrators are advised to allow only trusted users to have network access.Administrators are advised to run both firewall and antivirus applications to minimize the potential of inbound and outbound threats.Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.Administrators can help protect affected systems from external attacks by using a solid firewall strategy.Administrators are advised to monitor affected systems.

Vendor Announcements

Fixed Software

  • Jenkins has released a software update at the following link: Jenkins 2.160

Duncan Newell

Duncan is a technology professional with over 20 years experience of working in various IT roles. He has a interest in cyber security, and has a wide range of other skills in radio, electronics and telecommunications.

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