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TI-2017-13313 Aliases CVE-2017-18106GHSA-4vj3-9qjv-52hq

Improper authentication in Atlassian Crowd

Priority LOW 35CWE-287Published · Updated

Key facts

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

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-287.

Summary

The identifier_hash for a session token in Atlassian Crowd before version 2.9.1 could potentially collide with an identifier_hash for another user or a user in a different directory, this allows remote attackers who can authenticate to Crowd or an application using Crowd for authentication to gain access to another user's session provided they can make their identifier hash collide with another user's session identifier hash.

Why it matters now

EPSS 0.01235 69th percentileScored 2026-11-07
Fix Fixed Crowd (Atlassian): 2.9.1

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
AtlassianCrowdbefore 2.9.12.9.1Patch availableCNA
  • Crowd VendorAtlassian Affected before 2.9.1 Fixed in 2.9.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:*before 2.9.1VulnerableAtlassian
  • cpe:2.3:a:atlassian:crowd:*:*:*:*:*:*:*:* Versions before 2.9.1 Vulnerable ·Atlassian

Remediation

  • Fix · CNA Crowd (Atlassian) Fixed in 2.9.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2017-18106
  2. 2026-10-03 Alias added: GHSA-4vj3-9qjv-52hq

References

Advisory 1

  • TI-2019-08653 Atlassian Crowd and Crowd Data Center had the pdkinstall development plugin incorrectly… KEVCVSS 3.1CRITICAL 9.8
  • TI-2026-67904 Arbitrary file access in Atlassian Data Center products KEVCVSS 4.0CRITICAL 9.3
  • TI-2012-02540 Atlassian JIRA before 5.0.1; Confluence before 3.5.16, 4.0 before 4.0.7, and 4.1 before… CVSS 3.1CRITICAL 9.1
  • TI-2022-09598 Improper authentication in Atlassian Bamboo Server CVSS 3.1CRITICAL 9.8
  • TI-2022-21516 Affected versions of Atlassian Crowd allow an attacker to authenticate as the crowd… CVSS 3.1CRITICAL 9.8
  • TI-2016-05568 The LDAP directory connector in Atlassian Crowd before 2.8.8 and 2.9.x before 2.9.5… CVSS 3.0CRITICAL 9.8
See all 24 →

Sources

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