{
    "id": "CVE-2021-26084",
    "published": "2021-08-30 07:15:06",
    "last_modified": "2026-06-17 03:42:49",
    "cvss_score": "9.8",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
    "cwe": "CWE-917",
    "description": "In affected versions of Confluence Server and Data Center, an OGNL injection vulnerability exists that would allow an unauthenticated attacker to execute arbitrary code on a Confluence Server or Data Center instance. The affected versions are before version 6.13.23, from version 6.14.0 before 7.4.11, from version 7.5.0 before 7.11.6, and from version 7.12.0 before 7.12.5.",
    "epss_score": "0.99999",
    "epss_percentile": "0.99993",
    "kev": 1,
    "kev_due": "2021-11-17",
    "has_exploit": 1,
    "updated_at": "2026-09-26 18:27:58",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2021-11-17."
    },
    "products": [
        {
            "vendor": "atlassian",
            "product": "confluence_data_center"
        },
        {
            "vendor": "atlassian",
            "product": "confluence_server"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2021-26084",
        "date_added": "2021-11-03",
        "due_date": "2021-11-17",
        "vendor": "Atlassian",
        "product": "Confluence Server and Data Center",
        "name": "Atlassian Confluence Server and Data Center Object-Graph Navigation Language (OGNL) Injection Vulnerability",
        "ransomware": 1
    },
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "50243",
            "title": "Confluence Server 7.12.4 - 'OGNL injection' Remote Code Execution (RCE) (Unauthenticated)",
            "date": "2021-09-01",
            "url": "https://www.exploit-db.com/exploits/50243"
        }
    ],
    "refs_list": [
        "http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html",
        "https://jira.atlassian.com/browse/CONFSERVER-67940",
        "http://packetstormsecurity.com/files/167449/Atlassian-Confluence-Namespace-OGNL-Injection.html",
        "https://jira.atlassian.com/browse/CONFSERVER-67940",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-26084"
    ]
}