CVE-2026-48916: Jenkins LDAP Plugin Remote Code Execution via LDAP Referrals

CVE-2026-48916 · Severity: medium · CVSS 6.6 · Published 2026-05-27

The Jenkins LDAP Plugin, which allows Jenkins to use LDAP directories for user authentication, is vulnerable to a remote code execution flaw. If an attacker can control the LDAP server or intercept network traffic between Jenkins and the server, they can redirect Jenkins to a malicious source. This allows the attacker to run unauthorized code on the Jenkins controller, potentially leading to a full system takeover and access to sensitive build data.

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

Quick answers

Is CVE-2026-48916 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-48916 being exploited in the wild.
How severe is CVE-2026-48916?
Medium severity, with a CVSS score of 6.6, published 27 May 2026.
Which products and versions are affected?
Jenkins Project LDAP Plugin <= 807.v7d7de30930cf, 807.v7d7de30930cf and earlier; org.jenkins-ci.plugins:ldap (Maven) <= 807.v7d7de30930cf, ECOSYSTEM:introduced=0,fixed=807.809.vd3a.
Is there a fix for CVE-2026-48916?
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-2026-48916 attacked?
It is attacked over the network, in a software library.
Am I affected by CVE-2026-48916?
Check whether you run Jenkins Project LDAP Plugin or 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. An attacker who controls the configured LDAP server or can perform a Machine-in-the-Middle (MitM) attack can provide a referral pointing to a malicious RMI URL. When Jenkins follows this referral, it attempts to deserialize attacker-controlled data. If suitable 'gadget' classes are present on the classpath, this results in Remote Code Execution (RCE) on the Jenkins controller. The vulnerability is tracked as a combination of SSRF (CWE-918) and unsafe deserialization. It has been patched in version 807.809.vd3a_4e5e4ec98 by disabling the following of LDAP referrals.

Affected products

  • Jenkins Project LDAP Plugin <= 807.v7d7de30930cf

Identifiers

  • CVE-2026-48916
  • GHSA-fmjp-mw89-c6h6

Timeline

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

References

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