vulntracker.iovulntracker.io
© 2026 vulntracker.io

CVE-2021-26074

MEDIUM
6.5
CVSS Score
Published: April 16, 2021 at 03:00 AM 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?

Get instant alerts when new vulnerabilities affect Atlassian Connect Spring Boot (ACSB) - before attackers find them.

Real-time alertsTrack your software stackFree plan available
Start FreeSign In
Severity
MEDIUM6.5
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

Description

Broken Authentication in Atlassian Connect Spring Boot (ACSB) from version 1.1.0 before version 2.1.3: 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 from version 1.1.0 before version 2.1.3 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 < 2.1.31.1.0 ≤ v < 2.1.31.1.0
Affected range stops below 2.1.3, so it looks safe — our inference, not a vendor statement

References (2)

x_refsource_MISCVendor 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=1051986106

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

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

CVSS

6.5MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-287

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create accountSign in
Free plan, no card