CVE-2026-48919: Active directory Jenkins Active Directory Plugin Deserializes Vulnerability

MODERATE
Advisory Identifier: GHSA-p2gw-f3rv-82mw
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CVSS 6.6
CWE-502
Published
Advisory Summary

CVE-2026-48919 is a MODERATE (CVSS 6.6) jenkins active directory plugin deserializes vulnerability (CWE-502: Deserialization of Untrusted Data) affecting Active directory libraries in the Maven ecosystem. The issue involves jenkins active directory plugin deserializes data from ldap referrals without validation. Remediation is available by upgrading affected packages to version 2.41.1.

CVE-2026-48919 at a Glance

CVE Identifier CVE-2026-48919
GHSA Identifier GHSA-p2gw-f3rv-82mw
Severity MODERATE
CVSS v3.1 Base Score 6.6
CWE Classification CWE-502: Deserialization of Untrusted Data
Affected Product Active directory
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 6.6

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity High (AC:H)
Privileges Required High (PR:H)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-48919

To remediate this vulnerability, upgrade all affected Active directory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

org.jenkins-ci.plugins:active-directory fixed: 2.41.1 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>active-directory</artifactId>
    <version>2.41.1</version>
</dependency>
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

mvn dependency:tree -Dincludes=org.jenkins-ci.plugins

How to Check if You Are Affected

To determine whether your Java application is affected by CVE-2026-48919, inspect your build dependencies using the Maven Dependency Plugin:

mvn dependency:tree -Dincludes=org.jenkins-ci.plugins

Analyze the terminal output to locate any version of Active directory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 2.41.1), your application is affected.

Note: The mvn dependency:tree -Dincludes=org.jenkins-ci.plugins command inspects the resolved dependency graph declared in your project's POM files; it does not perform automated security scanning or inspect runtime dynamic classpaths. Always verify runtime container classpaths and shaded JARs.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-502: Deserialization of Untrusted Data, where the product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid. In Active directory, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

Jenkins Active Directory Plugin 2.41 and earlier follows LDAP referrals from the configured Active Directory server by default. These can forward to an RMI URL that causes Jenkins to deserialize attacker-controlled data, resulting in Remote Code Execution (RCE) on the Jenkins controller if deserialization "gadgets" are available on the classpath. This allows attackers able to control the configured Active Directory server, or able to perform a machine-in-the-middle attack, to execute code on the Jenkins controller. Active Directory Plugin 2.41.1 no longer follows LDAP referrals by default. Administrators unable to update to a fixed version can start Jenkins with the Java system property `hudson.plugins.active_directory.referral.ignore` set to `true` to mitigate the vulnerability. Administrators of Jenkins controllers requiring following LDAP referrals can set the Java system property `hudson.plugins.active_directory.referral.ignore` to `false` to restore the previous behavior.

CVE-2026-48919 Affected Active directory Versions

1 component(s)
Fixed Versions:
2.41.1
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:active-directory
maven/org.jenkins-ci.plugins/active-directory
Maven
< 2.41.1
2.41.1

References

NVD — CVE-2026-48919 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-48919
Active directory Source Repository REPOSITORY
https://github.com/jenkinsci/active-directory-plugin
Active directory Security Information SECURITY
https://www.jenkins.io/security/advisory/2026-05-27/#SECURITY-3659

Frequently Asked Questions

What is CVE-2026-48919?
CVE-2026-48919 is a security vulnerability in Active directory involving Jenkins Active Directory Plugin deserializes data from LDAP referrals without validation under CWE-502: Deserialization of Untrusted Data.
Which Active directory versions are affected?
Affected versions include releases prior to 2.41.1 across affected packages: org.jenkins-ci.plugins:active-directory.
What version fixes CVE-2026-48919?
Upgrading to 2.41.1 (or the latest patched release for your respective branch) resolves the vulnerability.
Is active-directory affected?
Yes, org.jenkins-ci.plugins:active-directory is affected in releases prior to 2.41.1. Upgrade your dependency to 2.41.1 or later.
What is the CVSS score of CVE-2026-48919?
CVE-2026-48919 has a CVSS v3.1 base score of 6.6 (MODERATE) with vector string CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H.
What CWE is associated with CVE-2026-48919?
CVE-2026-48919 is classified under CWE-502: Deserialization of Untrusted Data (The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.).
How can I check Maven dependencies for CVE-2026-48919?
Run the dependency tree command: 'mvn dependency:tree -Dincludes=org.jenkins-ci.plugins'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-p2gw-f3rv-82mw",
  "modified" : "2026-07-01T19:39:04Z",
  "published" : "2026-05-27T15:33:26Z",
  "aliases" : [ "CVE-2026-48919" ],
  "summary" : "Jenkins Active Directory Plugin deserializes data from LDAP referrals without validation",
  "details" : "Jenkins Active Directory Plugin 2.41 and earlier follows LDAP referrals from the configured Active Directory server by default. These can forward to an RMI URL that causes Jenkins to deserialize attacker-controlled data, resulting in Remote Code Execution (RCE) on the Jenkins controller if deserialization \"gadgets\" are available on the classpath.\n\nThis allows attackers able to control the configured Active Directory server, or able to perform a machine-in-the-middle attack, to execute code on the Jenkins controller.\n\nActive Directory Plugin 2.41.1 no longer follows LDAP referrals by default.\n\nAdministrators unable to update to a fixed version can start Jenkins with the Java system property `hudson.plugins.active_directory.referral.ignore` set to `true` to mitigate the vulnerability.\n\nAdministrators of Jenkins controllers requiring following LDAP referrals can set the Java system property `hudson.plugins.active_directory.referral.ignore` to `false` to restore the previous behavior.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:active-directory"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "2.41.1"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-48919"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/jenkinsci/active-directory-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2026-05-27/#SECURITY-3659"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-502" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-01T19:39:04Z",
    "nvd_published_at" : "2026-05-27T15:16:31Z"
  }
}