{
    "id": "CVE-2021-42136",
    "published": "2022-04-13 16:15:09",
    "last_modified": "2026-06-17 04:09:24",
    "cvss_score": "9.0",
    "cvss_severity": "CRITICAL",
    "cvss_version": "3.1",
    "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H",
    "cwe": "CWE-79",
    "description": "A stored Cross-Site Scripting (XSS) vulnerability in the Missing Data Codes functionality of REDCap before 11.4.0 allows remote attackers to execute JavaScript code in the client's browser by storing said code as a Missing Data Code value. This can then be leveraged to execute a Cross-Site Request Forgery attack to escalate privileges to administrator.",
    "epss_score": "0.04657",
    "epss_percentile": "0.91427",
    "kev": 0,
    "kev_due": null,
    "has_exploit": 1,
    "updated_at": "2026-09-27 18:17:31",
    "priority": {
        "rank": 2,
        "label": "Patch early",
        "why": "A public exploit exists."
    },
    "products": [
        {
            "vendor": "vanderbilt",
            "product": "redcap"
        }
    ],
    "kev_detail": null,
    "exploits": [
        {
            "source": "exploit-db",
            "ref_id": "50877",
            "title": "REDCap 11.3.9 - Stored Cross Site Scripting",
            "date": "2022-04-19",
            "url": "https://www.exploit-db.com/exploits/50877"
        }
    ],
    "refs_list": [
        "http://packetstormsecurity.com/files/166723/REDCap-Cross-Site-Scripting.html",
        "https://redcap.med.usc.edu/_shib/assets/ChangeLog_Standard.pdf",
        "https://www.project-redcap.org/",
        "http://packetstormsecurity.com/files/166723/REDCap-Cross-Site-Scripting.html",
        "https://redcap.med.usc.edu/_shib/assets/ChangeLog_Standard.pdf",
        "https://www.project-redcap.org/"
    ]
}