CVE-2019-20106: 
JIRA vulnerability analysis and mitigation

A broken access control vulnerability (CVE-2019-20106) was discovered in Atlassian Jira Server and Data Center. The vulnerability affects versions before 7.13.12, versions 8.0.0 to 8.5.4, and version 8.6.0 before 8.6.1. This security flaw was disclosed on February 5, 2020 (AttackerKB).

The vulnerability allows remote attackers to make comments on tickets where they do not have commenting permissions due to a broken access control bug. The vulnerability has been assigned a CVSS v3.1 Base Score of 4.3 (Medium) with the following vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N. The attack vector is network-based, with low attack complexity, requiring low privileges and no user interaction (AttackerKB).

The vulnerability impacts the integrity of the affected systems by allowing unauthorized users to post comments on tickets they shouldn't have access to. The CVSS metrics indicate no impact on confidentiality or availability, with only a low impact on integrity (AttackerKB).

Atlassian has released fixed versions to address this vulnerability. Users should upgrade to version 7.13.12 or later, 8.5.4 or later, or 8.6.1 or later depending on their current version track (Jira Issue).