CVE-2025-10640Public exploitNetwork attack vector

Administrative access via client-controlled login result

Published Oct 21, 2025 · Updated Oct 21, 2025

Authentication bypass in EfficientLab Work Examiner Professional 4.0.0.52001 and earlier allows remote attackers to gain administrative access. The console accepts a success flag returned by the server without enforcing that result server-side, so changing the response byte from 0 to 1 or patching the client bypasses the login check. Network access to the custom console protocol on TCP port 12306 is sufficient to expose monitored screenshots, keystrokes, and other administrative data.

CVSS severity9.8
Critical
EPSS probability0.88%
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 EfficientLab Work Examiner Professional 4.0.0.52001 and earlier allows remote attackers to gain administrative access. The console accepts a success flag returned by the server without enforcing that result server-side, so changing the response byte from 0 to 1 or patching the client bypasses the login check. Network access to the custom console protocol on TCP port 12306 is sufficient to expose monitored screenshots, keystrokes, and other administrative data.

The record

CVE
CVE-2025-10640
Published
Oct 21, 2025
Updated
Oct 21, 2025
Vendor
EfficientLab
Product
Work Examiner Professional
Classifications
CWE-602, CAPEC-115, T1556
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 21, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 21, 2025Record 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=<= 4.0.0.52001

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

EfficientLab · Work Examiner Professionalversion=<= 4.0.0.52001

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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-602Client-Side Enforcement of Server-Side Security
CAPEC-115Authentication Bypass
T1556Modify Authentication Process

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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