{
    "id": "CVE-2021-3311",
    "published": "2021-02-05 14:15:19",
    "last_modified": "2026-06-17 04:04:55",
    "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-613",
    "description": "An issue was discovered in October through build 471. It reactivates an old session ID (which had been invalid after a logout) once a new login occurs. NOTE: this violates the intended Auth/Manager.php authentication behavior but, admittedly, is only relevant if an old session ID is known to an attacker.",
    "epss_score": "0.02903",
    "epss_percentile": "0.86591",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 0,
    "updated_at": "2026-10-11 18:17:26",
    "priority": {
        "rank": 3,
        "label": "In your normal cycle",
        "why": "Critical by CVSS (9.8), but no sign of active exploitation."
    },
    "products": [
        {
            "vendor": "octobercms",
            "product": "october"
        }
    ],
    "kev_detail": null,
    "exploits": [],
    "refs_list": [
        "https://anisiosantos.me/october-cms-token-reactivation",
        "https://github.com/octobercms/library/commit/642f597489e6f644d4bd9a0c267e864cabead024",
        "https://octobercms.com/forum/chan/announcements",
        "https://anisiosantos.me/october-cms-token-reactivation",
        "https://github.com/octobercms/library/commit/642f597489e6f644d4bd9a0c267e864cabead024",
        "https://octobercms.com/forum/chan/announcements"
    ]
}