CVE-2026-24898Public exploitNetwork attack vector

Unauthenticated token disclosure via MedEx callback

Published Mar 3, 2026 · Updated Mar 3, 2026

Authentication bypass in OpenEMR before 8.0.0 allows remote attackers to obtain MedEx API tokens through the callback endpoint. library/MedEx/MedEx.php disables authentication and, for any supplied callback_key, performs a MedEx login and returns the complete JSON response. MedEx must be enabled; exposed bearer tokens and practice or event metadata permit unauthorized MedEx actions and disclosure of patient information.

CVSS severity10.0
Critical
EPSS probability0.56%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in OpenEMR before 8.0.0 allows remote attackers to obtain MedEx API tokens through the callback endpoint. library/MedEx/MedEx.php disables authentication and, for any supplied callback_key, performs a MedEx login and returns the complete JSON response. MedEx must be enabled; exposed bearer tokens and practice or event metadata permit unauthorized MedEx actions and disclosure of patient information.

The record

CVE
CVE-2026-24898
Published
Mar 3, 2026
Updated
Mar 3, 2026
Vendor
OpenEMR Foundation
Product
OpenEMR
Classifications
CWE-306, CWE-200, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 3, 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

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenEMR Foundation · OpenEMRversion=< 8.0.0

Published CVSS scores

9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
10.0GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1190Exploit Public-Facing Application

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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