CVE-2021-26077

HIGH

Atlassian Connect Spring Boot 1.1.0-2.1.3 and 2.1.4-2.1.5 - Improper Authentication via Context JWT Acceptance

Title source: llm

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.

References (2)

Core 2

Core References

Exploit, Issue Tracking, Vendor Advisory x_refsource_misc

https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072

Vendor Advisory x_refsource_misc

https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147

Scores

CVSS v3 8.8

EPSS 0.0039

EPSS Percentile 60.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA SSVC

Vulnrichment

Exploitation none

Automatable no

Technical Impact partial

Details

CWE

CWE-287

Status published

Products (2)

atlassian/connect_spring_boot 1.1.0 - 2.1.3

com.atlassian.connect/atlassian-connect-spring-boot 1.1.0 - 2.1.3Maven

Published May 10, 2021

Tracked Since Feb 18, 2026