CVE-2021-26077

Description

Broken Authentication in Atlassian Connect Spring Boot (ACSB) in version 1.1.0 before 2.1.3 and from version 2.1.4 before 2.1.5: Atlassian Connect Spring Boot is a Java Spring Boot package for building Atlassian Connect apps. Authentication between Atlassian products and the Atlassian Connect Spring Boot app occurs with a server-to-server JWT or a context JWT. Atlassian Connect Spring Boot versions 1.1.0 before 2.1.3 and versions 2.1.4 before 2.1.5 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.

How to fix CVE-2021-26077

To remediate CVE-2021-26077, upgrade the affected package to a fixed version below.

• —upgrade to 2.1.3 or later

Is CVE-2021-26077 being exploited?

Low — EPSS is 0.4%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• >= 1.1.0, < 2.1.3

CVSS scores

References (3)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-26077
• WEBcommunity.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072
• WEBconfluence.atlassian.com/pages/viewpage.action?pageId=1063555147