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Vulnerability · Published Apr 16, 2021 · Assigned by atlassian

CVE-2021-26073

High 7.7

In plain English

A high-severity improper authentication in Atlassian Connect Express (ACE) from Atlassian. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 61% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.7High
Exploit odds (30 days)0.9%top 38.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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 from 3.0.2 before 6.6.0 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
npmatlassian-connect-express6.6.0GHSA-4v96-m8xv-x83v

Affected products (as reported)

VendorProductVersions
Atlassian Atlassian Connect Express (ACE) 3.0.2 – before unspecifiedunspecified – before 6.6.0

Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:N

References