CVE-2026-33346Public exploitNetwork attack vector

Staff-session script execution via unescaped payment data

Published Mar 19, 2026 · Updated Mar 19, 2026

Stored XSS in OpenEMR 8.0.0.1 and earlier allows remote authenticated users to execute JavaScript in a reviewing staff member's browser. The payment handler stores inv_values verbatim in onsite_portal_activity.table_args, and portal_payment.php inserts it into a single-quoted script string without JavaScript encoding. A patient portal account can plant the payload, but execution requires a staff member to review the payment; the script runs with that staff session's access.

CVSS severity8.7
High
EPSS probability0.32%
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 8.0.0.1 and earlier allows remote authenticated users to execute JavaScript in a reviewing staff member's browser. The payment handler stores inv_values verbatim in onsite_portal_activity.table_args, and portal_payment.php inserts it into a single-quoted script string without JavaScript encoding. A patient portal account can plant the payload, but execution requires a staff member to review the payment; the script runs with that staff session's access.

The record

CVE
CVE-2026-33346
Published
Mar 19, 2026
Updated
Mar 19, 2026
Vendor
OpenEMR Foundation
Product
OpenEMR
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 19, 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=< 8.0.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

OpenEMR Foundation · OpenEMRversion=< 8.0.0.2

Published CVSS scores

8.7GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/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.

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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')
T1203Exploitation for Client Execution

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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