OS Command Injection in Atlassian Bamboo (CVE-2026-21571)
Summary
OS command injection in Atlassian Bamboo (CVE-2026-21571). Successful exploitation can lead to full system takeover.
Original description
The description as published by the source.
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]).
Source: NIST National Vulnerability Database NVD GitHub Advisory
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-21571 has been found in Atlassian Bamboo.
Successful exploitation can lead to full system takeover. CVSS score: 8.8/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Atlassian Bamboo CVE-2026-21571" on the vendor's site.
CVE-2026-21571 (Atlassian Bamboo) — CWE-78 / CVSS v3 8.8
Attack vector: remote (network-reachable) / no user interaction
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
OS command injection (CWE-78) exists in Atlassian Bamboo.
Check the vendor advisory for the affected versions of Atlassian Bamboo.
Severity: High (CVSS 8.8/10). Successful exploitation can lead to full system takeover.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'Bamboo' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'Bamboo' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
Bambooを grep し、稼働しているサービス・バージョンを把握する。 -
2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- web confluence.atlassian.com
- web jira.atlassian.com
- web nvd.nist.gov
- web github.com