CVE-2026-48917: Jenkins LDAP Plugin unvalidated deserialization in LDAP referrals

CVE-2026-48917 · Severity: medium · CVSS 6.6 · Published 2026-05-27

The Jenkins LDAP plugin, which allows Jenkins to use corporate directories for user login, contains a security flaw in how it handles server redirections. If an attacker can control the LDAP server or intercept network traffic, they can redirect Jenkins to a malicious server that triggers unauthorized code execution. This could allow an attacker to take full control of the Jenkins controller, potentially compromising the entire software delivery pipeline and sensitive credentials.

Technologies: org.jenkins-ci.plugins:ldap (Maven). Vendors: Maven.

Quick answers

Is CVE-2026-48917 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-48917 being exploited in the wild.
How severe is CVE-2026-48917?
Medium severity, with a CVSS score of 6.6, published 27 May 2026.
Which products and versions are affected?
org.jenkins-ci.plugins:ldap (Maven) <= 807.v7d7de30930cf, ECOSYSTEM:introduced=0,fixed=807.809.vd3a.
Is there a fix for CVE-2026-48917?
Yes. org.jenkins-ci.plugins:ldap (Maven): upgrade to 807.809.vd3a or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-48917 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-48917?
Check whether you run org.jenkins-ci.plugins:ldap (Maven) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • org.jenkins-ci.plugins:ldap (Maven): upgrade to 807.809.vd3a or later
    # set org.jenkins-ci.plugins:ldap to 807.809.vd3a in your pom.xml or build.gradle

Technical details

The Jenkins LDAP Plugin (versions 807.v7d7de30930cf and earlier) fails to validate LDAP referrals, allowing them to point to arbitrary RMI URLs. When the plugin follows such a referral from a compromised or attacker-controlled LDAP server, it triggers the deserialization of untrusted data. If suitable 'gadget' classes are present on the Jenkins controller's classpath, this leads to Remote Code Execution (RCE). Exploitation requires the attacker to either control the configured LDAP server or perform a machine-in-the-middle (MitM) attack. The vulnerability is addressed in version 807.809.vd3a_4e5e4ec98 by disabling the following of LDAP referrals.

Affected products

  • Jenkins LDAP Plugin <= 807.v7d7de30930cf

Identifiers

  • CVE-2026-48917
  • GHSA-x9v8-p946-5pwc

Timeline

  • 2026-05-27: disclosed
  • 2026-05-27: advisory
  • 2026-05-27: patched

References

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