{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-21571", "assignerOrgId": "f08a6ab8-ed46-4c22-8884-d911ccfe3c66", "state": "PUBLISHED", "assignerShortName": "atlassian", "dateReserved": "2026-01-01T00:00:40.720Z", "datePublished": "2026-04-21T17:00:05.524Z", "dateUpdated": "2026-04-21T17:24:23.557Z"}, "containers": {"cna": {"affected": [{"vendor": "Atlassian", "product": "Bamboo Data Center", "versions": [{"version": "12.1.0 to 12.1.3", "status": "affected"}, {"version": "12.0.0 to 12.0.2", "status": "affected"}, {"version": "11.0.0 to 11.0.8", "status": "affected"}, {"version": "10.2.0 to 10.2.16", "status": "affected"}, {"version": "10.1.0 to 10.1.1", "status": "affected"}, {"version": "10.0.0 to 10.0.3", "status": "affected"}, {"version": "9.6.2 to 9.6.24", "status": "affected"}, {"version": "12.1.6", "status": "unaffected"}, {"version": "10.2.18", "status": "unaffected"}, {"version": "9.6.25", "status": "unaffected"}]}], "descriptions": [{"lang": "en", "value": "This Critical severity OS Command Injection vulnerability was introduced in versions 9.6.0, 10.0.0, 10.1.0, 10.2.0,\r\n11.0.0, 11.1.0, 12.0.0, and 12.1.0 of Bamboo Data Center.\r\n\u00a0\r\nThis RCE (Remote Code Execution) vulnerability, with a CVSS Score of 9.4 and a CVSS Vector of\r\nCVSS: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\r\non the remote system, which has high impact to confidentiality, high impact to integrity, high impact to availability,\r\nand requires no user interaction.\r\n\u00a0\r\nAtlassian recommends that Bamboo Data Center customers upgrade to latest version, if you are unable to do so, upgrade\r\nyour instance to one of the specified supported fixed versions:\r\n Bamboo Data Center 9.6.0: Upgrade to a release greater than or equal to 9.6.25\r\n Bamboo Data Center 10.2: Upgrade to a release greater than or equal to 10.2.18\u00a0\r\n Bamboo Data Center 12.1: Upgrade to a release greater than or equal to 12.1.6\r\n\r\nSee the release notes ([https://confluence.atlassian.com/bambooreleases/bamboo-release-notes-1189793869.html]). 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{"cveTags": [], "descriptions": [{"lang": "en", "value": "This Critical severity OS Command Injection vulnerability was introduced in versions 9.6.0, 10.0.0, 10.1.0, 10.2.0,\r\n11.0.0, 11.1.0, 12.0.0, and 12.1.0 of Bamboo Data Center.\r\n\u00a0\r\nThis RCE (Remote Code Execution) vulnerability, with a CVSS Score of 9.4 and a CVSS Vector of\r\nCVSS: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\r\non the remote system, which has high impact to confidentiality, high impact to integrity, high impact to availability,\r\nand requires no user interaction.\r\n\u00a0\r\nAtlassian recommends that Bamboo Data Center customers upgrade to latest version, if you are unable to do so, upgrade\r\nyour instance to one of the specified supported fixed versions:\r\n Bamboo Data Center 9.6.0: Upgrade to a release greater than or equal to 9.6.25\r\n Bamboo Data Center 10.2: Upgrade to a release greater than or equal to 10.2.18\u00a0\r\n Bamboo Data Center 12.1: Upgrade to a release greater than or equal to 12.1.6\r\n\r\nSee 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])."}], "id": "CVE-2026-21571", "lastModified": "2026-04-21T18:16:21.483", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 9.4, "baseSeverity": "CRITICAL", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "LOW", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "subIntegrityImpact": "HIGH", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@atlassian.com", "type": "Secondary"}]}, "published": "2026-04-21T17:16:22.950", "references": [{"source": "security@atlassian.com", "url": "https://confluence.atlassian.com/pages/viewpage.action?pageId=1770913890"}, {"source": "security@atlassian.com", "url": "https://jira.atlassian.com/browse/BAM-26364"}], "sourceIdentifier": "security@atlassian.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-78"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

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{"affected": [{"configurations": [{"platform": ["data_center"], "status": "affected", "versions": {"scheme": "semver", "value": "[12.1.0,12.1.3]"}}, {"platform": ["data_center"], "status": "affected", "versions": {"scheme": "semver", "value": "[12.0.0,12.0.2]"}}, {"platform": ["data_center"], "status": "affected", "versions": {"scheme": "semver", "value": "[11.0.0,11.0.8]"}}, {"platform": ["data_center"], "status": "affected", "versions": {"scheme": "semver", "value": "[10.2.0,10.2.16]"}}, {"platform": ["data_center"], "status": "affected", "versions": {"scheme": "semver", "value": "[10.1.0,10.1.1]"}}, {"platform": ["data_center"], "status": "affected", "versions": {"scheme": "semver", "value": "[10.0.0,10.0.3]"}}, {"platform": ["data_center"], "status": "affected", "versions": {"scheme": "semver", "value": "[9.6.2,9.6.24]"}}, {"platform": ["data_center"], "status": "unaffected", "versions": {"scheme": "semver", "value": "12.1.6"}}, {"platform": ["data_center"], "status": "unaffected", "versions": {"scheme": "semver", "value": "10.2.18"}}, {"platform": ["data_center"], "status": "unaffected", "versions": {"scheme": "semver", "value": "9.6.25"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Bamboo Data Center", "source": "cna", "vendor": "Atlassian"}, "product": "bamboo", "vendor": "atlassian"}], "analysis": {"en": {"generated_at": "2026-04-21T22:35:49.132893+00:00", "value": {"mitigation_remediation": ["Identify whether your Bamboo Data Center instance is running one of the vulnerable versions listed above.", "Upgrade the instance to a supported fixed release (9.6.25 or newer, 10.2.18 or newer, or 12.1.6 or newer).", "Apply network segmentation or firewall rules to limit external access to the Bamboo servers until the upgrade is complete."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "The issue affects Atlassian Bamboo Data Center running any of the following versions released before the indicated fixes: 9.6.0 through 9.6.24, the earlier 10.x releases up to 10.2.17, and the earlier 12.x releases up to 12.1.5. Atlassian recommends upgrading to Bamboo Data Center 9.6.25 or later, 10.2.18 or later, or 12.1.6 or later to eliminate the vulnerability.", "description_and_impact": "This vulnerability is an OS Command Injection flaw that allows an authenticated attacker to execute arbitrary commands on a Bamboo Data Center server. The flaw provides complete compromise of confidentiality, integrity, and availability, and requires no user interaction. According to the CVSS vector, the attack can be performed over a network with low attack complexity and low required privileges.", "risk_and_exploitability": "With a CVSS score of 9.4 and an EPSS score that is not available, the risk remains high. The flaw is listed as not part of the CISA KEV catalogue. Because the vulnerability can be exploited by anyone who can authenticate to the Bamboo service, a compromised or malicious user can gain full control over the underlying host. The lack of user interaction and the low attack complexity mean that a determined attacker can quickly achieve full system compromise."}}}}, "created": "2026-04-21T18:30:27.390020+00:00", "title": "Critical OS Command Injection in Atlassian Bamboo Data Center Enabling Remote Code Execution", "updated": "2026-04-21T22:45:16.051686+00:00", "vendors": ["atlassian", "atlassian$PRODUCT$bamboo"], "weaknesses": ["CWE-78"]}