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  • CVE-2020-26073 - Broken authentication in Atlassian Connect Express (ACE)
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Description

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. This is fixed in version 6.6.0.

Affected versions

  • 3.0.2 - 6.5.0

Fixed versions

  • 6.6.0 and later

Severity

This is an independent assessment and you should evaluate its applicability to your own IT environment.

CVSS v3 score: 9.1 => Critical severity

Exploitability Metrics

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone


Scope Metric

ScopeChanged


Impact Metrics

ConfidentialityHigh
IntegrityLow
AvailabilityLow

https://asecurityteam.bitbucket.io/cvss_v3/#CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L


What you need to do
 

Atlassian recommends that you upgrade to the latest version. Upgrade to atlassian-connect-express to 6.6.0 or higher.


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