CVE-2022-26138
Published 2022-07-20 · Updated 2026-06-17 · Source security@atlassian.com
Summary
CVE-2022-26138 is a critical-severity (CVSS 9.8) vulnerability in Atlassian Confluence. CISA added it to the Known Exploited Vulnerabilities catalog on July 29, 2022, which means exploitation in the wild has been confirmed; US federal agencies had to remediate it by August 19, 2022. CISA does not currently list it as used in ransomware campaigns. Atlassian has 14 vulnerabilities in the KEV catalog, 8 of them linked to ransomware.
All 14 known-exploited Atlassian vulnerabilities →Description
The Atlassian Questions For Confluence app for Confluence Server and Data Center creates a Confluence user account in the confluence-users group with the username disabledsystemuser and a hardcoded password. A remote, unauthenticated attacker with knowledge of the hardcoded password could exploit this to log into Confluence and access all content accessible to users in the confluence-users group. This user account is created when installing versions 2.7.34, 2.7.35, and 3.0.2 of the app.
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA Known-Exploited Vulnerability
Product: Atlassian — Confluence
Name: Atlassian Questions For Confluence App Hard-coded Credentials Vulnerability
Date added: 2022-07-29 · Due: 2022-08-19
Required action: Apply updates per vendor instructions.
References
- https://confluence.atlassian.com/doc/confluence-security-advisory-2022-07-20-1142446709.html
- https://jira.atlassian.com/browse/CONFSERVER-79483
- https://confluence.atlassian.com/doc/confluence-security-advisory-2022-07-20-1142446709.html
- https://jira.atlassian.com/browse/CONFSERVER-79483
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26138