CVE-2026-21571: This Critical severity OS Command Injection vulnerability was introduced in versions 9.6.0, 10.0.0, 10.1.0, 10.2.0…
CVE-2026-21571 · Severity: high · CVSS 8.8 · Published 2026-04-21
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]).
No. Junglewise Threat Intelligence has no report of CVE-2026-21571 being exploited in the wild.
How severe is CVE-2026-21571?
High severity, with a CVSS score of 8.8, published 21 April 2026.
Which products and versions are affected?
Atlassian Bamboo. The advisory does not name versions.
Is there a fix for CVE-2026-21571?
No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
Am I affected by CVE-2026-21571?
Check whether you run Atlassian Bamboo. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.