CVE-2026-21586

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{"affected": [{"affectedData": [{"product": "Confluence Data Center", "vendor": "Atlassian", "versions": [{"status": "affected", "version": "10.2.1 to 10.2.15"}, {"status": "affected", "version": "10.1.0 to 10.1.2"}, {"status": "affected", "version": "10.0.2 to 10.0.3"}, {"status": "affected", "version": "9.5.1 to 9.5.4"}, {"status": "affected", "version": "9.4.0 to 9.4.1"}, {"status": "affected", "version": "9.3.1 to 9.3.2"}, {"status": "affected", "version": "9.2.0 to 9.2.23"}, {"status": "affected", "version": "9.1.1"}, {"status": "affected", "version": "8.9.7 to 8.9.8"}, {"status": "affected", "version": "8.5.16 to 8.5.31"}, {"status": "affected", "version": "7.19.28 to 7.19.30"}, {"status": "unaffected", "version": "10.2.17 to 10.2.18"}, {"status": "unaffected", "version": "9.2.24 to 9.2.25"}]}], "source": "security@atlassian.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "This High severity Improper Authorization vulnerability was introduced in versions 7.4.0, 7.13.0, 8.5.0, 8.9.0, 9.0.1, 9.1.0, 9.2.0, 9.3.1, 9.4.0, 9.5.1, 10.0.2, 10.1.0, and 10.2.0 of Confluence Data Center.\r\n\r\nThis Improper Authorization vulnerability, with a CVSS Score of 7.1, allows an authenticated attacker to gain unintended access and can lead to the exposure of resources or functionality, possibly providing attackers with sensitive information or even execute arbitrary code.\r\n\r\nAtlassian recommends that Confluence 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:\r\n Confluence Data Center 9.2: Upgrade to a release greater than or equal to 9.2.24\r\n\r\n Confluence Data Center 10.2: Upgrade to a release greater than or equal to 10.2.17\r\n\r\nSee the release notes ([https://confluence.atlassian.com/doc/confluence-release-notes-327.html]). You can download the latest version of Confluence Data Center from the download center ([https://www.atlassian.com/software/confluence/download-archives]).\r\n\r\nThis vulnerability was reported via our Penetration Testing program."}], "id": "CVE-2026-21586", "lastModified": "2026-09-17T12:17:31.453", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "NETWORK", "availabilityRequirement": "NOT_DEFINED", "baseScore": 7.1, "baseSeverity": "HIGH", "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": "NONE", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "userInteraction": "NONE", "valueDensity": "NOT_DEFINED", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/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": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "NONE", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "security@atlassian.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-21586", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-09-16T03:56:45.509123Z", "version": "2.0.3"}}]}, "published": "2026-09-15T17:17:11.580", "references": [{"source": "security@atlassian.com", "url": "https://confluence.atlassian.com/pages/viewpage.action?pageId=1822852209"}, {"source": "security@atlassian.com", "url": "https://jira.atlassian.com/browse/CONFSERVER-104418"}], "sourceIdentifier": "security@atlassian.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-285"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[10.2.1,10.2.15]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[10.1.0,10.1.2]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[10.0.2,10.0.3]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.5.1,9.5.4]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.4.0,9.4.1]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.3.1,9.3.2]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[9.2.0,9.2.23]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "9.1.1"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.9.7,8.9.8]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.5.16,8.5.31]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[7.19.28,7.19.30]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[10.2.17,10.2.18]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[9.2.24,9.2.25]"}}], "enrichment": {"confidence": 95.0, "confidence_source": "inferred", "scores": [{"score": 95.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Confluence Data Center", "source": "cna", "vendor": "Atlassian"}, "product": "confluence_data_center", "vendor": "atlassian"}], "created": "2026-09-15T19:00:13.703755+00:00", "title": "Improper Authorization Enables Authenticated Access to Sensitive Data in Confluence Data Center", "updated": "2026-09-20T15:30:17.545446+00:00", "vendors": ["atlassian", "atlassian$PRODUCT$confluence_data_center"]}