CVE-2026-40551

Arbitrary-user authentication via client binary modification

Published Apr 28, 2026 · Updated Apr 28, 2026

Authentication bypass in BinSoft mpGabinet Lekarski 23.12.19 and earlier allows local users to authenticate as arbitrary users. The desktop client verifies logins locally instead of requiring the backend server to validate identity, so a modified application binary can omit the check. Access to an installed client connected to the backend and low local privileges are required; exploitation grants another user's application identity and associated data access.

CVSS severity8.4
High
EPSS probability0.13%
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 BinSoft mpGabinet Lekarski 23.12.19 and earlier allows local users to authenticate as arbitrary users. The desktop client verifies logins locally instead of requiring the backend server to validate identity, so a modified application binary can omit the check. Access to an installed client connected to the backend and low local privileges are required; exploitation grants another user's application identity and associated data access.

The record

CVE
CVE-2026-40551
Published
Apr 28, 2026
Updated
Apr 28, 2026
Vendor
BinSoft
Product
mpGabinet Lekarski
Classifications
CWE-603, T1556
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=0 <=23.12.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

BinSoft · mpGabinet Lekarskiversion=0 <=23.12.19

Published CVSS scores

8.4CERT PolskaCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/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.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-603Use of Client-Side Authentication
T1556Modify Authentication Process

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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