CVE-2021-26074 Broken Authentication in Atlassian Connect Spring Boot
Attackers can bypass authentication in lifecycle endpoints by sending context JWTs, allowing unauthorized re-installation events in Atlassian Connect apps.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-26074?
CVE-2021-26074 is a medium-severity authentication bypass vulnerability in Atlassian Connect Spring Boot (ACSB), published on 16 Apr 2021. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Broken Authentication in Atlassian Connect Spring Boot (ACSB) from version 1.1.0 before version 2.1.3: 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 from version 1.1.0 before version 2.1.3 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.
Weakness: CWE-287
Which versions are affected by CVE-2021-26074?
2 open source packages ship an affected version, including com.atlassian.connect:atlassian-connect-spring-boot-starter. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
com.atlassian.connect:atlassian-connect-spring-boot-starter Maven | From 1.1.0 | 2.1.3 |
com.atlassian.connect:atlassian-connect-spring-boot-starter Maven | From 1.1.0 | 2.1.3 |
Products include Atlassian Connect Spring Boot.
How do I fix CVE-2021-26074?
Upgrade com.atlassian.connect:atlassian-connect-spring-boot-starter to 2.1.3 or later.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2021-26074 being exploited?
There is no known exploitation of CVE-2021-26074 in the wild and no public exploit code.
Other vulnerabilities in Atlassian Connect Spring Boot (ACSB)
Sources
Also known as GHSA-cpcr-74q9-74gp.