CVE-2026-21571Network attack vector

Authenticated command execution

Published Apr 21, 2026 · Updated Apr 21, 2026

OS command injection in Atlassian Bamboo Data Center allows remote authenticated users to execute commands on the application server. Atlassian identifies the flaw as OS command injection but has not published the affected component, input field, or command-construction operation. Low-privileged authenticated access is required; successful exploitation needs no user interaction and can compromise the server and connected data.

CVSS severity9.4
Critical
EPSS probability1.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

OS command injection in Atlassian Bamboo Data Center allows remote authenticated users to execute commands on the application server. Atlassian identifies the flaw as OS command injection but has not published the affected component, input field, or command-construction operation. Low-privileged authenticated access is required; successful exploitation needs no user interaction and can compromise the server and connected data.

The record

CVE
CVE-2026-21571
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
Atlassian
Product
Bamboo Data Center
Classifications
CWE-78, T1059
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.0 to 10.0.3
  2. Affected versionversion=10.1.0 to 10.1.1
  3. Affected versionversion=10.2.0 to 10.2.16
  4. Affected versionversion=11.0.0 to 11.0.8
  5. Affected versionversion=12.0.0 to 12.0.2
  6. Affected versionversion=12.1.0 to 12.1.3
  7. Affected versionversion=9.6.2 to 9.6.24

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Atlassian · Bamboo Data Centerversion=10.0.0 to 10.0.3; version=10.1.0 to 10.1.1; version=10.2.0 to 10.2.16; version=11.0.0 to 11.0.8; version=12.0.0 to 12.0.2; version=12.1.0 to 12.1.3; version=9.6.2 to 9.6.24

Published CVSS scores

9.4AtlassianCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
8.8NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-78Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
T1059Command and Scripting Interpreter

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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