{
    "id": "CVE-2026-20253",
    "published": "2026-06-10 18:16:40",
    "last_modified": "2026-07-23 09:10:00",
    "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-306",
    "description": "In Splunk Enterprise 10.2 versions below 10.2.4 and 10 versions below 10.0.7, an unauthenticated user could create or truncate arbitrary files through a PostgreSQL sidecar service endpoint. The vulnerability exists because the PostgreSQL sidecar service endpoint lacks authentication controls, allowing any network-reachable user to invoke file operations without credentials. Splunk Enterprise versions 9.4 and earlier are not affected. If you cannot immediately upgrade to a fixed version, you can mitigate this vulnerability by disabling the PostgreSQL sidecar service.",
    "epss_score": "0.96939",
    "epss_percentile": "0.99889",
    "kev": 1,
    "kev_due": "2026-06-21",
    "has_exploit": 0,
    "updated_at": "2026-09-26 18:42:55",
    "priority": {
        "rank": 1,
        "label": "Patch first",
        "why": "On CISA KEV — known exploited in the wild, due 2026-06-21."
    },
    "products": [
        {
            "vendor": "splunk",
            "product": "splunk"
        }
    ],
    "kev_detail": {
        "cve_id": "CVE-2026-20253",
        "date_added": "2026-06-18",
        "due_date": "2026-06-21",
        "vendor": "Splunk",
        "product": "Enterprise",
        "name": "Splunk Enterprise Missing Authentication for Critical Function Vulnerability",
        "ransomware": 0
    },
    "exploits": [],
    "refs_list": [
        "https://advisory.splunk.com/advisories/SVD-2026-0603",
        "https://labs.watchtowr.com/why-use-app-level-auth-when-every-database-has-auth-splunk-enterprise-cve-2026-20253-pre-auth-rce/",
        "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-20253"
    ]
}