Widely deployed CI/CD platform; RCE could disrupt builds across orgs.
CVE-2026-21570
Authenticated RCE in Bamboo Data Center.
Is CVE-2026-21570 being exploited?
Not confirmed. CVE-2026-21570 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.57% probability of exploitation in the next 30 days.
How severe is CVE-2026-21570?
CVE-2026-21570 is rated High with a CVSS score of 8.6. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-21570?
Yes. A fix has been recorded for CVE-2026-21570. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-21570 affect?
CVE-2026-21570 affects Atlassian Bamboo Data Center v9.6.0, v10.0.0, v10.1.0, v10.2.0, v11.0.0, v11.1.0, v12.0.0, v12.1.0. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-21570?
Upgrade to fixed versions: >=9.6.24, >=10.2.16, or >=12.1.3
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Authenticated attacker can execute arbitrary code on the Bamboo server, gaining control.
Immediate action required
- affected12.1.0 to 12.1.2
- affected12.0.0 to 12.0.2
- affected11.0.0 to 11.0.8
- affected10.2.0 to 10.2.15
- affected10.1.0 to 10.1.1
- affected10.0.0 to 10.0.3
- affected9.6.1 to 9.6.23
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.