What is the CVSS score of CVE-2026-21570?

CVE-2026-21570 has a CVSS 4.0 base score of 8.6 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. EPSS exploitation probability: 0.6%.

How to fix or mitigate CVE-2026-21570?

Within 24 hours: Audit all Bamboo Data Center instances to identify affected versions (9.6.0-12.1.0). Restrict administrative access and review recent user activity logs for suspicious behavior. Within 7 days: Deploy patches to the earliest affected version tier (9.6.24+, 10.2.16+, or 12.1.3+). Test patches in non-production environments first. Within 30 days: Complete patching of all production instances and verify build pipeline integrity.

Bamboo Data Center CVE-2026-21570

EUVD-2026-12590 HIGH

Code Injection (CWE-94)

2026-03-17 atlassian

RCE Code Injection Atlassian Bamboo Data Center

8.6

CVSS 4.0 · Vendor: atlassian

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Authenticate as high-privilege user
Exploit

Submit malicious code payload
Execution

Trigger code execution via CWE-94 mechanism
Impact

Achieve remote code execution on Bamboo server

Vulnerability Assessment

Weakness	CWE CWE-94 OWASP Top 10:2025 A05:2025 - Injection ASVS 5.0 V1 - Encoding and Sanitization Code injection prevention, sandbox exec MITRE ATT&CK 2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	Requires authenticated access to Bamboo Data Center versions 9.6.0–12.1.0 (fixed in 9.6.24+). Attacker must have high-privilege credentials to execute remote code. No user interaction needed.
Impact	Complete system compromise — the attacker gains the ability to install malware, steal data, create backdoors, or pivot to other systems on the network.
Exploit ScenarioDerived	An attacker sends a specially crafted request to the vulnerable service that triggers code execution with the privileges of the running process.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).

No patch listed yet 0.6% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 17, 2026

Remote code execution in Atlassian Bamboo Data Center versions 9.6.0 through 12.1.0 allows authenticated attackers with high privileges to execute arbitrary code on affected systems with a CVSS score of 8.6. The vulnerability impacts multiple major versions with no patch currently available, requiring immediate upgrade to patched releases such as 9.6.24, 10.2.16, or 12.1.3. Organizations unable to upgrade should prioritize access controls for high-privileged accounts until remediation is possible.

Earlier versions of this analysis (1)

v1 Mar 17, 2026 - 20:30 CVSS 8.6

RemediationAI

Apply vendor patches immediately. Restrict network access to vulnerable services. Implement network segmentation and monitoring for anomalous activity.

Affected VersionsENISA

Bamboo Data Center 10.2.0 to 10.2.15

Bamboo Data Center 12.0.0 to 12.0.2

Bamboo Data Center 11.0.0 to 11.0.8

Bamboo Data Center 10.0.0 to 10.0.3

Bamboo Data Center 12.1.0 to 12.1.2

Bamboo Data Center 9.6.1 to 9.6.23

Bamboo Data Center 10.1.0 to 10.1.1

Affected Packages

euvd bamboo_data_center_10_0_0_to no fix

euvd bamboo_data_center_10_1_0_to no fix

euvd bamboo_data_center_10_2_0_to no fix

euvd bamboo_data_center_11_0_0_to no fix

euvd bamboo_data_center_12_0_0_to no fix

euvd bamboo_data_center_12_1_0_to no fix

euvd bamboo_data_center_9_6_1_to no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 7 packages in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Remote code execution allows an attacker to run arbitrary commands or code on the target system over a network without prior authentication.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

Vendor (atlassian) PRIMARY 8.6 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (atlassian) · only source for this CVE.

CVSS VectorVendor: atlassian

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

High

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

High

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

DescriptionCVE.org

This High severity RCE (Remote Code Execution) 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 8.6, allows an authenticated attacker to execute malicious code on the remote system.

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: Upgrade to a release greater than or equal to 9.6.24

Bamboo Data Center 10.2: Upgrade to a release greater than or equal to 10.2.16

Bamboo Data Center 12.1: Upgrade to a release greater than or equal to 12.1.3

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]).

This vulnerability was reported via our Atlassian (Internal) program.

Executive ViewAI

Why It Matters

A critical Remote Code Execution vulnerability (CVSS 8.6) affects multiple versions of Bamboo Data Center, allowing authenticated attackers to execute arbitrary code on affected systems. This poses a significant risk to CI/CD pipeline integrity, build infrastructure, and potential lateral movement into development and production environments. Immediate action is required to upgrade or isolate affected instances.

Business Impact: High

Compensating Controls

Until patching is complete, implement the following interim controls: (1) Restrict network access to Bamboo Data Center to trusted IP ranges only; (2) Disable or restrict remote job execution capabilities where operationally feasible; (3) Enable enhanced audit logging for administrative actions and job execution; (4) Implement WAF rules to monitor and log suspicious authenticated requests to Bamboo APIs; (5) Require multi-factor authentication for all administrative accounts; (6) Increase monitoring for unusual process execution on Bamboo servers.

Threat Intelligence Overview

EPSS Score

0.6%

Top 31% exploitable

Data Quality

5 sources

Confidence: Medium

EUVD

NVD

CVE.org

EPSS

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC No

EPSS 0.6%

Patch available No

Active threat No

Deciding rule

HIGH severity (CVSS 7.0-8.9)

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Scheduled

Exploitation· derived

None

System Exposure· derived

Open

Automatable· derived

Human Impact

High

Priority Score

Low Medium High Critical

KEV: 0

EPSS: +1

CVSS: +43

PoC: 0

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Code Injection CRITICAL

Code injection occurs when an application accepts user input and passes it directly into a language interpreter or evaluator without proper sanitization.

Remote Code Execution CRITICAL

Remote Code Execution represents the critical moment when an attacker successfully runs arbitrary code on a target system without physical access.