What’s Vulnerable › Vulnerabilities

CVE-2021-42136

• Severity: critical (CVSS 9.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-04-13 · updated 2026-06-17
• Weakness: 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.

Affected products

• Vanderbilt REDCap: before 11.4.0 — fixed in 11.4.0

How to fix

Upgrade to a fixed version: Vanderbilt REDCap 11.4.0. Check the vendor advisory for mitigations.

References

• 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/

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