CVE-2021-26077

HighCVSS 8.8/10Last modified Jun 17, 2026

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.

Metrics

CVSS 3.1 8.8/10CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-287

Affected software

Vendor	Product	Versions
Atlassian	Atlassian Connect Spring Boot (ACSB)	>= 1.1.0, < unspecified; >= unspecified, < 2.1.3; >= 2.1.4, < unspecified; >= unspecified, < 2.1.5

References

https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072Exploit, Issue Tracking, Vendor Advisory
https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147Vendor Advisory
https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072Exploit, Issue Tracking, Vendor Advisory
https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147Vendor Advisory

Timeline

Published: May 10, 2021
Last modified: Jun 17, 2026
NVD status: Modified

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