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CVE-2021-26077

HIGH
8.8
CVSS Score
Published: May 9, 2021 at 11:55 PM UTC
Updated: June 17, 2026 at 03:42 AM UTC
1 product affected across 1 vendorConnect Spring Boot

Using Atlassian Connect Spring Boot (ACSB) by Atlassian?

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Severity
HIGH8.8
Exploit prediction
EPSS 1.0%
SSVC
No known exploit

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Connect Spring Boot· Atlassianatlassian-app
95%
v ≥ 1.1.0v ≥ 2.1.4v < 2.1.3v < 2.1.51.1.0 ≤ v < 2.1.32.1.4 ≤ v < 2.1.51.1.02.1.4
Affected range stops below 2.1.3, so it looks safe — our inference, not a vendor statement
Affected range stops below 2.1.5, so it looks safe — our inference, not a vendor statement

References (2)

x_refsource_MISCExploitIssue TrackingVendor Advisory
Source: [email protected]
https://community.developer.atlassian.com/t/action-required-atlassian-connect-vulnerability-allows-bypass-of-app-qsh-verification-via-context-jwts/47072
x_refsource_MISCVendor Advisory
Source: [email protected]
https://confluence.atlassian.com/pages/viewpage.action?pageId=1063555147

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-287

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