High severity · published Apr 21, 2026
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, 11.0.0, 11.1.0, 12.0.0, and 12.1.0 of Bamboo Data Center
8.8
CVSS
1.3%
EPSS
No
On KEV
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]).
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.3% · higher than 71% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
BD
Bamboo Data Center · Atlassian
12.1.0 to 12.1.3; 12.0.0 to 12.0.2; 11.0.0 to 11.0.8; 10.2.0 to 10.2.16; 10.1.0 to 10.1.1; 10.0.0 to 10.0.3; +1 more · source: vendor
BA
Bamboo · Atlassian
9.6.2 before 9.6.25; 10.0.0 before 10.2.18; 11.0.0 before 12.1.6 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-21571
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-21571
Vendor Advisory
https://confluence.atlassian.com/pages/viewpage.action?pageId=1770913890
Issue Tracking
https://jira.atlassian.com/browse/BAM-26364
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