CVE-2021-4288Network attack vector

Stored XSS via incorrect appId context encoding

Published Dec 27, 2022 · Updated Aug 3, 2024

Cross-site scripting in OpenMRS Reference Application Module 2.11 and earlier allows remote authenticated users to inject script via appId. The userApp.gsp template HTML-escapes appId but then applies escapeJs rather than context-appropriate JavaScript encoding before placing it in an input value attribute. An authenticated user must store a crafted application identifier and another user must load the User App page, allowing script execution in that user's browser.

CVSS severity3.5
Low
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in OpenMRS Reference Application Module 2.11 and earlier allows remote authenticated users to inject script via appId. The userApp.gsp template HTML-escapes appId but then applies escapeJs rather than context-appropriate JavaScript encoding before placing it in an input value attribute. An authenticated user must store a crafted application identifier and another user must load the User App page, allowing script execution in that user's browser.

The record

CVE
CVE-2021-4288
Published
Dec 27, 2022
Updated
Aug 3, 2024
Vendor
OpenMRS
Product
OpenMRS Reference Application Module
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 27, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.0
  2. Affected versionversion=2.1
  3. Affected versionversion=2.10
  4. Affected versionversion=2.11
  5. Affected versionversion=2.2
  6. Affected versionversion=2.3
  7. Affected versionversion=2.4
  8. Affected versionversion=2.5
  9. Affected versionversion=2.6
  10. Affected versionversion=2.7
  11. Affected versionversion=2.8
  12. Affected versionversion=2.9

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenMRS · OpenMRS Reference Application Moduleversion=2.0; version=2.1; version=2.10; version=2.11; version=2.2; version=2.3; version=2.4; version=2.5; version=2.6; version=2.7; version=2.8; version=2.9

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
3.5VulDBCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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