Vulnerability · Published May 9, 2021 · Assigned by atlassian
CVE-2021-26077
Critical 9.1
In plain English
A critical-severity improper authentication in Atlassian Connect Spring Boot (ACSB) from Atlassian. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.0% (higher than 61% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | com.atlassian.connect:atlassian-connect-spring-boot | 2.1.3 | GHSA-2x7v-w2mv-f3rx |
| Maven | com.atlassian.connect:atlassian-connect-spring-boot | 2.1.5 | GHSA-2x7v-w2mv-f3rx |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Atlassian | Atlassian Connect Spring Boot (ACSB) | 1.1.0 – before unspecifiedunspecified – before 2.1.32.1.4 – before unspecifiedunspecified – before 2.1.5 |
Weakness: CWE-287 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L