{"id":"CVE-2021-42136","aliases":["EUVD-2021-29119","GHSA-q99w-xr78-49hh"],"status":"published","title":"A stored Cross-Site Scripting (XSS) vulnerability in the Missing Data Codes Functionality of...","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.","severity":{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"critical","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.04657,"percentile":0.9181,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-79"],"published":"2022-04-13T15:32:56Z","modified":"2026-06-17T04:09:24Z","exploits":[{"source":"exploitdb","id":"EDB-50877","title":"REDCap 11.3.9 - Stored Cross Site Scripting","type":"webapps","platform":"php","date":"2022-04-19","url":"https://www.exploit-db.com/exploits/50877"}],"products":[{"vendor":"vanderbilt","product":"redcap"}],"references":[{"url":"https://www.project-redcap.org/","tags":["x_refsource_MISC","x_transferred","Product"]},{"url":"https://redcap.med.usc.edu/_shib/assets/ChangeLog_Standard.pdf","tags":["x_refsource_MISC","x_transferred","Release Notes","Third Party Advisory"]},{"url":"http://packetstormsecurity.com/files/166723/REDCap-Cross-Site-Scripting.html","tags":["x_refsource_MISC","x_transferred","Exploit","Third Party Advisory","VDB Entry"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-42136"},{"url":"https://github.com/advisories/GHSA-q99w-xr78-49hh"}],"sources":{"cve":[{"id":"CVE-2021-42136","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.","status":"published","published":"2022-04-13T15:32:56Z","modified":"2024-08-04T03:30:37.558Z","updated_at":"2026-11-02T14:32:58.739039Z"}],"euvd":[{"id":"EUVD-2021-29119","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.","status":"published","published":"2022-04-13T15:32:56Z","modified":"2024-08-04T03:30:37Z","updated_at":"2026-11-03T03:24:16.217613Z"}],"ghsa":[{"id":"GHSA-q99w-xr78-49hh","title":"A stored Cross-Site Scripting (XSS) vulnerability in the Missing Data Codes Functionality of...","description":"A stored Cross-Site Scripting (XSS) vulnerability in the Missing Data Codes Functionality of REDCap 11.2.5 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.","status":"published","published":"2022-04-14T00:00:17Z","modified":"2023-01-27T05:01:35Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"critical"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:41:55.795759Z"}],"nvd":[{"id":"CVE-2021-42136","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.","status":"published","published":"2022-04-13T16:15:09.563Z","modified":"2026-06-17T04:09:24.537Z","cvss":[{"version":"3.1","score":9,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H","level":"critical","assessor":"primary"},{"version":"2.0","score":3.5,"vector":"AV:N/AC:M/Au:S/C:N/I:P/A:N","level":"low","assessor":"primary"}],"cwes":["CWE-79"],"updated_at":"2026-11-02T14:07:06.029737Z"}]}}