Paper/Archive/CVE-2021-26077

CVE-2021-26077

Atlassian Atlassian Connect Spring Boot (ACSB) — 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: Atlassia…

EPSS 1.0%CVSS 9.1

critical.is priorityof 100

CVSS 9.1 (ADP)9.1 / 10 × 3027.3 Not in CISA KEV+300.0 EPSS percentile 61.3.613 × 2012.3 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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

ProductAffectedFixed inSource

Atlassian Connect Spring Boot (ACSB)1.1.0 – < unspecifiedunspecifiedCNA

Atlassian Connect Spring Boot (ACSB)unspecified – < 2.1.32.1.3CNA

Atlassian Connect Spring Boot (ACSB)2.1.4 – < unspecifiedunspecifiedCNA

Atlassian Connect Spring Boot (ACSB)unspecified – < 2.1.52.1.5CNA

Scores by source

CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:L

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refcommunity.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072 refconfluence.atlassian.com/pages/viewpage.action?pageId=1063555147