{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-21580", "assignerOrgId": "f08a6ab8-ed46-4c22-8884-d911ccfe3c66", "state": "PUBLISHED", "assignerShortName": "atlassian", "dateReserved": "2026-01-01T00:00:40.721Z", "datePublished": "2026-08-18T22:00:00.396Z", "dateUpdated": "2026-08-20T15:36:48.127Z" }, "containers": { "cna": { "affected": [ { "vendor": "Atlassian", "product": "Confluence Data Center", "versions": [ { "version": "10.2.0 to 10.2.11", "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 9.2.20", "status": "affected" }, { "version": "9.1.0 to 9.1.1", "status": "affected" }, { "version": "9.0.3", "status": "affected" }, { "version": "8.9.6 to 8.9.8", "status": "affected" }, { "version": "8.5.15 to 8.5.31", "status": "affected" }, { "version": "7.19.27 to 7.19.30", "status": "affected" }, { "version": "10.2.13 to 10.2.15", "status": "unaffected" }, { "version": "9.2.21 to 9.2.23", "status": "unaffected" } ] }, { "vendor": "Atlassian", "product": "Confluence Server", "versions": [ { "version": "8.5.15 to 8.5.31", "status": "affected" }, { "version": "7.19.27 to 7.19.30", "status": "affected" } ] } ], "descriptions": [ { "lang": "en", "value": "This Critical severity Stored XSS, PrivEsc (Privilege Escalation), and Security Misconfiguration vulnerability was introduced in versions 7.1.1, 7.4.0, 7.13.0, 7.17.0, 7.19.0, 8.0.0, 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 and Server.\r\n\r\nThis Stored XSS, PrivEsc (Privilege Escalation), and Security Misconfiguration vulnerability, with a CVSS Score of 8.6, allows an unauthenticated attacker to execute arbitrary HTML or JavaScript code on a victims browser, perform actions as a higher-privileged user, and to get into the system utilizing loopholes exposed from security best-practices being overlooked.\r\n\r\nAtlassian recommends that Confluence Data Center and Server 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 and Server 9.2: Upgrade to a release greater than or equal to 9.2.21\r\n\r\n Confluence Data Center and Server 10.2: Upgrade to a release greater than or equal to 10.2.13\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 and Server from the download center ([https://www.atlassian.com/software/confluence/download-archives]).\r\n\r\nThis vulnerability was reported via our Bug Bounty program." } ], "problemTypes": [ { "descriptions": [ { "description": "Stored XSS", "lang": "en", "type": "Stored XSS" } ] } ], "references": [ { "url": "https://confluence.atlassian.com/pages/viewpage.action?pageId=1821999768" }, { "url": "https://jira.atlassian.com/browse/CONFSERVER-104381" } ], "metrics": [ { "cvssV4_0": { "version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N", "baseScore": 8.6, "baseSeverity": "HIGH" } } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "criteria": "cpe:2.3:a:atlassian:confluence_data_center:*:*:*:*:*:*:*:*", "versionStartIncluding": "9.4.0", "versionEndIncluding": "9.4.1", "vulnerable": true }, { "criteria": 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