CVE-2026-48918: Active directory Jenkins Active Directory Plugin Follows Vulnerability

MODERATE
Advisory Identifier: GHSA-wrhr-54p6-q97f
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CVSS 6.6
CWE-918
Published
Advisory Summary

CVE-2026-48918 is a MODERATE (CVSS 6.6) jenkins active directory plugin follows vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Active directory libraries in the Maven ecosystem. The issue involves jenkins active directory plugin follows ldap referrals by default. Remediation is available by upgrading affected packages to version 2.41.1.

CVE-2026-48918 at a Glance

CVE Identifier CVE-2026-48918
GHSA Identifier GHSA-wrhr-54p6-q97f
Severity MODERATE
CVSS v3.1 Base Score 6.6
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
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-2026-48918

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-2026-48918, 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-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. 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-2026-48918 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-2026-48918 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-48918
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-2026-48918?
CVE-2026-48918 is a security vulnerability in Active directory involving Jenkins Active Directory Plugin follows LDAP referrals by default under CWE-918: Server-Side Request Forgery (SSRF).
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-2026-48918?
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-2026-48918?
CVE-2026-48918 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-2026-48918?
CVE-2026-48918 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check Maven dependencies for CVE-2026-48918?
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-wrhr-54p6-q97f",
  "modified" : "2026-07-01T19:30:25Z",
  "published" : "2026-05-27T15:33:26Z",
  "aliases" : [ "CVE-2026-48918" ],
  "summary" : "Jenkins Active Directory Plugin follows LDAP referrals by default",
  "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-2026-48918"
  }, {
    "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-918" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-01T19:30:25Z",
    "nvd_published_at" : "2026-05-27T15:16:31Z"
  }
}