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TI-2021-08026 Aliases CVE-2021-26074GHSA-cpcr-74q9-74gp

Improper authentication in Atlassian Connect Spring Boot

Priority LOW 30CWE-287Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and GitHub. Impact type from CWE-287.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00674 52nd percentileScored 2026-11-07
Fix Fixed Atlassian Connect Spring Boot (ACSB) (Atlassian): 2.1.3com.atlassian.connect:atlassian-connect-spring-boot-starter (Maven): 2.1.3

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
AtlassianAtlassian Connect Spring Boot (ACSB)1.1.0 and later; before 2.1.32.1.3Patch availableCNA
—com.atlassian.connect:atlassian-connect-spring-boot-starter (Maven)1.1.0 to before 2.1.32.1.3Patch availableGHSA-cpcr-74q9-74gp
  • Atlassian Connect Spring Boot (ACSB) VendorAtlassian Affected 1.1.0 and later; before 2.1.3 Fixed in 2.1.3 Patch available CNA
  • com.atlassian.connect:atlassian-connect-spring-boot-starter (Maven) Vendor— Affected 1.1.0 to before 2.1.3 Fixed in 2.1.3 Patch available GHSA-cpcr-74q9-74gp

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:atlassian:connect_spring_boot:*:*:*:*:*:*:*:*1.1.0 to before 2.1.3VulnerableAtlassian
  • cpe:2.3:a:atlassian:connect_spring_boot:*:*:*:*:*:*:*:* Versions 1.1.0 to before 2.1.3 Vulnerable ·Atlassian

Remediation

  • Fix · CNA Atlassian Connect Spring Boot (ACSB) (Atlassian) Fixed in 2.1.3
  • Fix · GHSA-cpcr-74q9-74gp com.atlassian.connect:atlassian-connect-spring-boot-starter (Maven) Fixed in 2.1.3 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-26074
  2. 2026-10-03 Alias added: GHSA-cpcr-74q9-74gp
  3. 2026-10-14 EPSS moved to the 50th–90th percentile

References

Advisory 3

  • TI-2021-08029 Improper authentication in Atlassian Connect Spring Boot CVSS 3.1CRITICAL 9.1

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences