Vulnerabilities in pkg:npm/atlassian-connect-express

PACKAGE
Advisory Identifier: GHSA-4v96-m8xv-x83v
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Advisory Summary

CVE-2021-26073 is a HIGH (CVSS 7.7) broken authentication vulnerability (CWE-287: Improper Authentication) affecting Atlassian connect express libraries in the npm ecosystem. The issue involves broken authentication in atlassian connect express. Remediation is available by upgrading affected packages to version 6.6.0.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:npm/atlassian-connect-express

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:npm/atlassian-connect-express. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-4v96-m8xv-x83v CVE-2021-26073 HIGH Broken Authentication in Atlassian Connect Express

CVE-2021-26073 at a Glance

CVE Identifier CVE-2021-26073
GHSA Identifier GHSA-4v96-m8xv-x83v
Severity HIGH
CVSS v3.1 Base Score 7.7
CWE Classification CWE-287: Improper Authentication
Affected Product Atlassian connect express
Package Ecosystem npm
Published Date
Last Updated

Security Impact

CVSS: 7.7

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:C/C:N/I:H/A:N).

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

How to Fix CVE-2021-26073

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

atlassian-connect-express fixed: 6.6.0 
npm install atlassian-connect-express@6.6.0
Verify Direct and Transitive Dependencies

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

npm ls atlassian-connect-express

How to Check if You Are Affected

To determine whether your Node.js application is affected by CVE-2021-26073, inspect your project dependencies using npm:

npm ls atlassian-connect-express

Analyze the terminal output to locate any version of Atlassian connect express in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 6.6.0), your application is affected.

Note: The npm ls atlassian-connect-express command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-287: Improper Authentication, where when an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. In Atlassian connect express, 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

Broken Authentication in Atlassian Connect Express (ACE) from version 3.0.2 before version 6.6.0: Atlassian Connect Express is a Node.js package for building Atlassian Connect apps. Authentication between Atlassian products and the Atlassian Connect Express app occurs with a server-to-server JWT or a context JWT. Atlassian Connect Express versions between 3.0.2 - 6.5.0 erroneously accept context JWTs in lifecycle endpoints (such as installation) where only server-to-server JWTs should be accepted, permitting an attacker to send authenticated re-installation events to an app.

CVE-2021-26073 Affected Atlassian connect express Versions

1 component(s)
Fixed Versions:
6.6.0
Product / Package Ecosystem Affected Versions Fixed Version
atlassian-connect-express
npm/atlassian-connect-express
npm
≥ 3.0.2
< 6.6.0
6.6.0

References

NVD — CVE-2021-26073 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-26073
community.developer.atlassian.com/t/action-required-a... WEB
https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-a%5B%E2%80%A6%5Dypass-of-app-qsh-verification-via-context-jwts/47072
confluence.atlassian.com/pages/viewpage.acti... WEB
https://confluence.atlassian.com/pages/viewpage.action?pageId=1051986099
Atlassian connect express Security Information SECURITY
https://security.netapp.com/advisory/ntap-20210604-0004
bitbucket.org/atlassian/atlassian... PACKAGE
http://bitbucket.org/atlassian/atlassian-connect-express

Frequently Asked Questions

What is CVE-2021-26073?
CVE-2021-26073 is a security vulnerability in Atlassian connect express involving Broken Authentication in Atlassian Connect Express under CWE-287: Improper Authentication.
Which Atlassian connect express versions are affected?
Affected versions include releases prior to 6.6.0 across affected packages: atlassian-connect-express.
What version fixes CVE-2021-26073?
Upgrading to 6.6.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is atlassian-connect-express affected?
Yes, atlassian-connect-express is affected in releases prior to 6.6.0. Upgrade your dependency to 6.6.0 or later.
What is the CVSS score of CVE-2021-26073?
CVE-2021-26073 has a CVSS v3.1 base score of 7.7 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N.
What CWE is associated with CVE-2021-26073?
CVE-2021-26073 is classified under CWE-287: Improper Authentication (When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.).
How can I check npm dependencies for CVE-2021-26073?
Run the dependency tree command: 'npm ls atlassian-connect-express'. 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-4v96-m8xv-x83v",
  "modified" : "2025-02-12T21:53:02Z",
  "published" : "2022-05-24T22:28:12Z",
  "aliases" : [ "CVE-2021-26073" ],
  "summary" : "Broken Authentication in Atlassian Connect Express",
  "details" : "Broken Authentication in Atlassian Connect Express (ACE) from version 3.0.2 before version 6.6.0: Atlassian Connect Express is a Node.js package for building Atlassian Connect apps. Authentication between Atlassian products and the Atlassian Connect Express app occurs with a server-to-server JWT or a context JWT. Atlassian Connect Express versions between 3.0.2 - 6.5.0 erroneously accept context JWTs in lifecycle endpoints (such as installation) where only server-to-server JWTs should be accepted, permitting an attacker to send authenticated re-installation events to an app.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "npm",
      "name" : "atlassian-connect-express"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "3.0.2"
      }, {
        "fixed" : "6.6.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-26073"
  }, {
    "type" : "WEB",
    "url" : "https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-a%5B%E2%80%A6%5Dypass-of-app-qsh-verification-via-context-jwts/47072"
  }, {
    "type" : "WEB",
    "url" : "https://confluence.atlassian.com/pages/viewpage.action?pageId=1051986099"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20210604-0004"
  }, {
    "type" : "PACKAGE",
    "url" : "http://bitbucket.org/atlassian/atlassian-connect-express"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-287", "CWE-863" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2025-02-12T21:53:02Z",
    "nvd_published_at" : "2021-04-16T03:15:00Z"
  }
}