A stored Cross-Site Scripting (XSS) vulnerability in the Missing Data Codes functionality…
Priority MEDIUM 46CWE-79Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Cross-site scripting
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-79.
Summary
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.
Why it matters now
EPSS 0.04657 91st percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:vanderbilt:redcap:*:*:*:*:*:*:*:* | before 11.4.0 | Vulnerable | Vanderbilt |
- cpe:2.3:a:vanderbilt:redcap:*:*:*:*:*:*:*:* Versions before 11.4.0 Vulnerable ·Vanderbilt
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-42136
- 2026-10-03 Alias added: GHSA-q99w-xr78-49hh
References
More Vanderbilt Redcap vulnerabilities
- TI-2024-30559 REDCap 14.7.0 allows HTML injection via the project title of a New Project action. CVSS 3.1MEDIUM 6.1
- TI-2022-20746 A reflected XSS vulnerability exists in REDCap before 12.04.18 in the Alerts &… CVSS 3.1MEDIUM 6.1
- TI-2024-37334 Cross-site scripting in Vanderbilt REDCap CVSS 3.1MEDIUM 5.4
- TI-2024-37333 Cross-site scripting in Vanderbilt REDCap CVSS 3.1MEDIUM 5.4
- TI-2024-24901 A stored cross-site scripting (XSS) vulnerability in the Calendar function of REDCap… CVSS 3.1MEDIUM 5.4
- TI-2024-24900 A stored cross-site scripting (XSS) vulnerability in the Public Survey function of REDCap… CVSS 3.1MEDIUM 5.4
Sources
- CVE-2021-42136 · CVE Program
- CVE-2021-42136 · NVD
- FIRST EPSS
- GHSA-q99w-xr78-49hh · GitHub Advisory Database · CC BY 4.0
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