Is CVE-2017-18106 actively exploited?

No active exploitation of CVE-2017-18106 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2017-18106 be exploited remotely?

Yes. CVE-2017-18106 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2017-18106?

CVE-2017-18106 has a CVSS score of 7.5 (HIGH).

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HIGH

CVE-2017-18106

CWE-287Published: March 29, 2019· Updated: Jun 17, 2026

7.5

CVSS v3.1

Official Description

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.

NVD Source

Technical Analysis

CVE-2017-18106 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.5.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.