{
    "id": "CVE-2026-49952",
    "published": "2026-06-15 20:16:29",
    "last_modified": "2026-06-17 10:55:48",
    "cvss_score": "9.1",
    "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:N",
    "cwe": "CWE-323",
    "description": "Discuz! X5.0 releases 20260320 through 20260501 contains an authentication bypass vulnerability that allows unauthenticated remote attackers to gain unauthorized access to database backup and restore functionality by exploiting a shared cryptographic key between UCenter integration and the database backup API exposed by dbbak.php. Attackers can inject a crafted payload through the username parameter during login to abuse the encryption oracle in logging_ctl::logging_more(), obtain a legitimately signed token, and use it to bypass authorization for database export and import operations, with the additional ability to trigger a race condition to impersonate arbitrary users.",
    "epss_score": "0.03651",
    "epss_percentile": "0.89198",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-27 18:17:59",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "52621",
            "title": "Discuz! X5.0 - Authentication Bypass",
            "date": "2026-07-07",
            "url": "https://www.exploit-db.com/exploits/52621"
        }
    ],
    "refs_list": [
        "https://gitee.com/Discuz/DiscuzX/commit/9962dad52c4c6999dabaf91ecd70377c680ff3c6",
        "https://karmainsecurity.com/KIS-2026-09",
        "https://karmainsecurity.com/chaining-bugs-in-discuz-from-race-condition-to-rce",
        "https://www.vulncheck.com/advisories/discuz-x5-0-authentication-bypass-via-dbbak-php-encryption-oracle",
        "http://seclists.org/fulldisclosure/2026/Jun/3"
    ]
}