CVE-2026-24890Public exploitNetwork attack vector

Provider signature forgery via unchecked portal parameters

Published Feb 25, 2026 · Updated Feb 25, 2026

Improper authorization in OpenEMR before 8.0.0 allows remote authenticated users to overwrite provider signatures through the patient portal. The portal/sign/lib/save-signature.php endpoint accepts type=admin-signature, forces the patient ID to zero, and uses an unchecked POST user value as the provider ID when updating or inserting the stored signature. A valid patient-portal session and an enabled portal are required; successful exploitation replaces a provider signature used on generated medical documents.

CVSS severity8.1
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in OpenEMR before 8.0.0 allows remote authenticated users to overwrite provider signatures through the patient portal. The portal/sign/lib/save-signature.php endpoint accepts type=admin-signature, forces the patient ID to zero, and uses an unchecked POST user value as the provider ID when updating or inserting the stored signature. A valid patient-portal session and an enabled portal are required; successful exploitation replaces a provider signature used on generated medical documents.

The record

CVE
CVE-2026-24890
Published
Feb 25, 2026
Updated
Feb 25, 2026
Vendor
OpenEMR Foundation
Product
OpenEMR
Classifications
CWE-285, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 25, 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 privilegesauthenticated

What is affected?

OpenEMR Foundation · OpenEMRversion=< 8.0.0

Published CVSS scores

8.1GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/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-285Improper Authorization
T1565.001Stored Data Manipulation

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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