CVE-2026-21571
CWE-78Published: April 21, 2026· Updated: Apr 22, 2026
Official Description
This Critical severity OS Command Injection vulnerability was introduced in versions 9.6.0, 10.0.0, 10.1.0, 10.2.0,
11.0.0, 11.1.0, 12.0.0, and 12.1.0 of Bamboo Data Center.
This RCE (Remote Code Execution) vulnerability, with a CVSS Score of 9.4 and a CVSS Vector of
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H allows an authenticated attacker to execute commands
on the remote system, which has high impact to confidentiality, high impact to integrity, high impact to availability,
and requires no user interaction.
Atlassian recommends that Bamboo Data Center customers upgrade to latest version, if you are unable to do so, upgrade
your instance to one of the specified supported fixed versions:
Bamboo Data Center 9.6.0: Upgrade to a release greater than or equal to 9.6.25
Bamboo Data Center 10.2: Upgrade to a release greater than or equal to 10.2.18
Bamboo Data Center 12.1: Upgrade to a release greater than or equal to 12.1.6
See the release notes ([https://confluence.atlassian.com/bambooreleases/bamboo-release-notes-1189793869.html]). You can download the latest version of Bamboo Data Center from the download center ([https://www.atlassian.com/software/bamboo/download-archives]).
Technical Analysis
CVE-2026-21571 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.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
All References (2)
Quick Facts
Related CVEs (CWE-78)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2026-21571 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts