CVE-2021-47817Public exploitNetwork attack vectorHinoki check available

Authenticated command execution via stored profile XSS

Published Jan 21, 2026 · Updated Jan 21, 2026

Stored XSS in OpenEMR 5.0.2.1 user profiles allows remote authenticated users to execute server commands through an administrator's browser. user_info.php emits the stored lname value without HTML encoding, so script code can submit a backtick-bearing form_sel_layouts value that backup.php concatenates into an exec() shell command. Patient Portal access and an administrator rendering the poisoned profile are required; successful chaining runs operating-system commands under the web server account.

CVSS severity4.8
Medium
EPSS probability0.71%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in OpenEMR 5.0.2.1 user profiles allows remote authenticated users to execute server commands through an administrator's browser. user_info.php emits the stored lname value without HTML encoding, so script code can submit a backtick-bearing form_sel_layouts value that backup.php concatenates into an exec() shell command. Patient Portal access and an administrator rendering the poisoned profile are required; successful chaining runs operating-system commands under the web server account.

The record

CVE
CVE-2021-47817
Published
Jan 21, 2026
Updated
Jan 21, 2026
Vendor
OpenEMR Foundation
Product
OpenEMR
Classifications
CWE-79, T1059.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 21, 2026Record 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=5.0.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenEMR Foundation · OpenEMRversion=5.0.2.1

Published CVSS scores

5.4VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
4.8VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA: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 exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.004Unix Shell

Public exploit references

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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