CVE-2026-40538 - Vulnerability Details - OpenCVE

An improper restriction of excessive authentication attempts vulnerability in Auto block in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows remote attackers to read limited files via brute-force attacks.

No CVSS v4.0

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Vendors	Products
Synology	Diskstation Manager

No data.

No data.

References

Link	Providers
https://www.synology.com/en-global/security/advisory/Synology_SA_26_06

History

Sat, 19 Sep 2026 22:30:00 +0000

Type	Values Removed	Values Added
First Time appeared		Synology Synology diskstation Manager
Vendors & Products		Synology Synology diskstation Manager

Sat, 19 Sep 2026 20:45:00 +0000

Type	Values Removed	Values Added
Title	Improper Restriction of Excessive Authentication Attempts Enables Brute‑Force File Access in Synology DSM

Sat, 19 Sep 2026 01:15:00 +0000

Type	Values Removed	Values Added
Title		Improper Restriction of Excessive Authentication Attempts Enables Brute‑Force File Access in Synology DSM

Fri, 18 Sep 2026 11:30:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Fri, 18 Sep 2026 08:45:00 +0000

Type	Values Removed	Values Added
Description		An improper restriction of excessive authentication attempts vulnerability in Auto block in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows remote attackers to read limited files via brute-force attacks.
Weaknesses		CWE-307
References		https://www.synology.com/en-global/security/advisory/Synology_SA_26_06
Metrics		cvssV3_1 `{'score': 3.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N'}`

MITRE

Status: PUBLISHED

Assigner: synology

Published: 2026-09-18T08:29:15.878Z

Updated: 2026-09-18T10:42:50.358Z

Reserved: 2026-04-14T01:01:14.607Z

Link: CVE-2026-40538

Vulnrichment

Updated: 2026-09-18T10:42:45.497Z

NVD

Status : Awaiting Analysis

Published: 2026-09-18T09:16:41.307

Modified: 2026-09-18T19:07:38.320

Link: CVE-2026-40538

Redhat

No data.

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-40538", "assignerOrgId": "db201096-a0cc-46c7-9a55-61d9e221bf01", "state": "PUBLISHED", "assignerShortName": "synology", "dateReserved": "2026-04-14T01:01:14.607Z", "datePublished": "2026-09-18T08:29:15.878Z", "dateUpdated": "2026-09-18T10:42:50.358Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "affected", "product": "DiskStation Manager (DSM)", "vendor": "Synology", "versions": [{"lessThan": "7.3.2-86009-2", "status": "affected", "version": "7.3.2", "versionType": "semver"}, {"lessThan": "7.2.2-72806-7", "status": "affected", "version": "7.2.2", "versionType": "semver"}, {"lessThan": "7.2.1-69057-10", "status": "affected", "version": "7.2.1", "versionType": "semver"}, {"lessThan": "7.2.1", "status": "unknown", "version": "0", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Andreas Rothenbacher (error401.de)"}], "descriptions": [{"lang": "en", "value": "An improper restriction of excessive authentication attempts vulnerability in Auto block in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows remote attackers to read limited files via brute-force attacks."}], "metrics": [{"cvssV3_1": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.7, "baseSeverity": "LOW", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-307", "description": "Improper Restriction of Excessive Authentication Attempts", "lang": "en", "type": "CWE"}]}], "references": [{"name": "Synology-SA-26:06 DSM", "url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_06"}], "providerMetadata": {"orgId": "db201096-a0cc-46c7-9a55-61d9e221bf01", "shortName": "synology", "dateUpdated": "2026-09-18T09:27:24.605Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-18T10:42:03.617664Z", "id": "CVE-2026-40538", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-18T10:42:50.358Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-40538", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-18T10:42:03.617664Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-18T10:42:45.497Z"}}], "cna": {"credits": [{"lang": "en", "type": "finder", "value": "Andreas Rothenbacher (error401.de)"}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.7, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "LOW"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Synology", "product": "DiskStation Manager (DSM)", "versions": [{"status": "affected", "version": "7.3.2", "lessThan": "7.3.2-86009-2", "versionType": "semver"}, {"status": "affected", "version": "7.2.2", "lessThan": "7.2.2-72806-7", "versionType": "semver"}, {"status": "affected", "version": "7.2.1", "lessThan": "7.2.1-69057-10", "versionType": "semver"}, {"status": "unknown", "version": "0", "lessThan": "7.2.1", "versionType": "semver"}], "defaultStatus": "affected"}], "references": [{"url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_06", "name": "Synology-SA-26:06 DSM"}], "descriptions": [{"lang": "en", "value": "An improper restriction of excessive authentication attempts vulnerability in Auto block in Synology DiskStation Manager (DSM) before 7.2.1-69057-10, 7.2.2-72806-7 and 7.3.2-86009-2 allows remote attackers to read limited files via brute-force attacks."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-307", "description": "Improper Restriction of Excessive Authentication Attempts"}]}], "providerMetadata": {"orgId": "db201096-a0cc-46c7-9a55-61d9e221bf01", "shortName": "synology", "dateUpdated": "2026-09-18T09:27:24.605Z"}}}, "cveMetadata": {"cveId": "CVE-2026-40538", "state": "PUBLISHED", "dateUpdated": "2026-09-18T10:42:50.358Z", "dateReserved": "2026-04-14T01:01:14.607Z", "assignerOrgId": "db201096-a0cc-46c7-9a55-61d9e221bf01", "datePublished": "2026-09-18T08:29:15.878Z", "assignerShortName": "synology"}, "dataVersion": "5.2"}