Advisory severityCritical9.4Atlassian

Critical [CVE-2026-21571] Confluence: 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 critical-severity Atlassian advisory covers CVE-2026-21571; related products: Confluence, Bamboo, Atlassian.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-21571 Source published Apr 22, 2026Source updated Aug 11, 2026

VulniPulse record published Jul 11, 2026Record updated Aug 11, 2026

CVE-2026-21571

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Summary

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.

your instance to one of the specified supported fixed versions:

See the release notes ([ ]).

Affected products named by the advisory: Confluence; Atlassian.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 3 months ago·verify at source

Fixed versions

9.6.0
9.6.25
10.2
10.2.18
12.1
12.1.6

Official advisory · high-confidence parse· fetched 3 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

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]).

Official advisory · high-confidence parse· fetched 3 months ago·verify at source

Discussion(0)

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