CVE-2021-25919Network attack vector

Stored XSS via unencoded MFA user name

Published Mar 22, 2021 · Updated Apr 30, 2025

Stored XSS in OpenEMR 5.0.2 through 6.0.0 allows remote authenticated users to execute JavaScript through a crafted user name. The MFA registration, TOTP, and U2F pages insert user_full_name into fieldset legends without text encoding, so stored markup reaches another user's browser. Creating the payload requires highly privileged user-administration access, and exploitation requires another user to view an affected MFA page.

CVSS severity4.8
Medium
EPSS probability69.89%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in OpenEMR 5.0.2 through 6.0.0 allows remote authenticated users to execute JavaScript through a crafted user name. The MFA registration, TOTP, and U2F pages insert user_full_name into fieldset legends without text encoding, so stored markup reaches another user's browser. Creating the payload requires highly privileged user-administration access, and exploitation requires another user to view an affected MFA page.

The record

CVE
CVE-2021-25919
Published
Mar 22, 2021
Updated
Apr 30, 2025
Vendor
OpenEMR Foundation
Product
OpenEMR
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Apr 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.0.2, 5.0.2.1, 5.0.2.2, 5.0.2.3, 5.0.2.4, 6.0.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

OpenEMR Foundation · OpenEMRversion=5.0.2, 5.0.2.1, 5.0.2.2, 5.0.2.3, 5.0.2.4, 6.0.0

Published CVSS scores

3.5NIST NVDAV:N/AC:M/Au:S/C:N/I:P/A:N
4.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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