CVE-2026-57304: Assembla Jenkins Assembla Plugin Has A Vulnerability

MODERATE
Advisory Identifier: GHSA-2r5w-jh6g-8hff
Share
CVSS 5.4
CWE-862
Published
Advisory Summary

CVE-2026-57304 is a MODERATE (CVSS 5.4) jenkins assembla plugin has a vulnerability (CWE-862: Missing Authorization) affecting Assembla libraries in the Maven ecosystem. The issue involves jenkins assembla plugin has a missing permission check. Remediation is available in the latest vendor maintenance releases.

CVE-2026-57304 at a Glance

CVE Identifier CVE-2026-57304
GHSA Identifier GHSA-2r5w-jh6g-8hff
Severity MODERATE
CVSS v3.1 Base Score 5.4
CWE Classification CWE-862: Missing Authorization
Affected Product Assembla
Package Ecosystem Maven
Published Date
Last Updated

Security Impact

CVSS: 5.4

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

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

How to Fix CVE-2026-57304

To remediate this vulnerability, upgrade all affected Assembla 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:assembla fixed: Latest secure release 
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>assembla</artifactId>
    <version>Latest secure release</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-2026-57304, 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 Assembla in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), 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-862: Missing Authorization, where the product does not perform an authorization check when an actor attempts to access a resource or perform an action. In Assembla, 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 Assembla Plugin 1.4 and earlier does not perform a permission check in an HTTP endpoint that tests the connection to an Assembla server. This allows attackers with Overall/Read permission to connect to an attacker-specified URL using an attacker-specified username and password. Additionally, this HTTP endpoint does not require POST requests, resulting in a cross-site request forgery (CSRF) vulnerability. As of publication of this advisory, there is no fix.

CVE-2026-57304 Affected Assembla Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
org.jenkins-ci.plugins:assembla
maven/org.jenkins-ci.plugins/assembla
Maven
≤ 1.4

References

NVD — CVE-2026-57304 NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-57304
Assembla Source Repository REPOSITORY
https://github.com/lucamilanesio/assembla-jenkins-plugin
Assembla Security Information SECURITY
https://www.jenkins.io/security/advisory/2026-06-24/#SECURITY-3692%20(2)

Frequently Asked Questions

What is CVE-2026-57304?
CVE-2026-57304 is a security vulnerability in Assembla involving Jenkins Assembla Plugin has a missing permission check under CWE-862: Missing Authorization.
Which Assembla versions are affected?
Affected versions include releases prior to current release patches across affected packages: org.jenkins-ci.plugins:assembla.
What version fixes CVE-2026-57304?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is assembla affected?
Yes, org.jenkins-ci.plugins:assembla is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-57304?
CVE-2026-57304 has a CVSS v3.1 base score of 5.4 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
What CWE is associated with CVE-2026-57304?
CVE-2026-57304 is classified under CWE-862: Missing Authorization (The product does not perform an authorization check when an actor attempts to access a resource or perform an action.).
How can I check Maven dependencies for CVE-2026-57304?
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-2r5w-jh6g-8hff",
  "modified" : "2026-09-25T19:47:45Z",
  "published" : "2026-06-24T15:31:48Z",
  "aliases" : [ "CVE-2026-57304" ],
  "summary" : "Jenkins Assembla Plugin has a missing permission check",
  "details" : "Jenkins Assembla Plugin 1.4 and earlier does not perform a permission check in an HTTP endpoint that tests the connection to an Assembla server.\n\nThis allows attackers with Overall/Read permission to connect to an attacker-specified URL using an attacker-specified username and password.\n\nAdditionally, this HTTP endpoint does not require POST requests, resulting in a cross-site request forgery (CSRF) vulnerability.\n\nAs of publication of this advisory, there is no fix.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Maven",
      "name" : "org.jenkins-ci.plugins:assembla"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "1.4"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-57304"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/lucamilanesio/assembla-jenkins-plugin"
  }, {
    "type" : "WEB",
    "url" : "https://www.jenkins.io/security/advisory/2026-06-24/#SECURITY-3692%20(2)"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-862" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-09-25T19:47:45Z",
    "nvd_published_at" : "2026-06-24T14:17:36Z"
  }
}