CVE-2026-13666 - Vulnerability Details - OpenCVE

An improper neutralization of CRLF sequences ('CRLF Injection') vulnerability in Sharing API in Synology DiskStation Manager (DSM) before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 and 7.4-90075 allows remote authenticated users to write limited files when a victim clicks a sharing URL.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact Low

Availability Impact None

User Interaction Required

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_13

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 21:15:00 +0000

Type	Values Removed	Values Added
Title	CRLF Injection in DiskStation Manager Sharing API Allows Authenticated File Write

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

Type	Values Removed	Values Added
Title		CRLF Injection in DiskStation Manager Sharing API Allows Authenticated File Write

Fri, 18 Sep 2026 21:30:00 +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 neutralization of CRLF sequences ('CRLF Injection') vulnerability in Sharing API in Synology DiskStation Manager (DSM) before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 and 7.4-90075 allows remote authenticated users to write limited files when a victim clicks a sharing URL.
Weaknesses		CWE-93
References		https://www.synology.com/en-global/security/advisory/Synology_SA_26_13
Metrics		cvssV3_1 `{'score': 3.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N'}`

MITRE

Status: PUBLISHED

Assigner: synology

Published: 2026-09-18T08:22:29.078Z

Updated: 2026-09-18T19:11:08.435Z

Reserved: 2026-06-29T10:30:40.284Z

Link: CVE-2026-13666

Vulnrichment

Updated: 2026-09-18T19:10:55.897Z

NVD

Status : Awaiting Analysis

Published: 2026-09-18T09:16:38.877

Modified: 2026-09-18T20:17:07.373

Link: CVE-2026-13666

Redhat

No data.

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-13666", "assignerOrgId": "db201096-a0cc-46c7-9a55-61d9e221bf01", "state": "PUBLISHED", "assignerShortName": "synology", "dateReserved": "2026-06-29T10:30:40.284Z", "datePublished": "2026-09-18T08:22:29.078Z", "dateUpdated": "2026-09-18T19:11:08.435Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "affected", "product": "DiskStation Manager (DSM)", "vendor": "Synology", "versions": [{"lessThan": "7.4-90075", "status": "affected", "version": "7.4", "versionType": "semver"}, {"lessThan": "7.3.2-86009-4", "status": "affected", "version": "7.3.2", "versionType": "semver"}, {"lessThan": "7.2.2-72806-9", "status": "affected", "version": "7.2.2", "versionType": "semver"}, {"lessThan": "7.2.1-69057-12", "status": "affected", "version": "7.2.1", "versionType": "semver"}, {"lessThan": "7.2.1", "status": "unknown", "version": "0", "versionType": "semver"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Brendan O'Rourke"}], "descriptions": [{"lang": "en", "value": "An improper neutralization of CRLF sequences ('CRLF Injection') vulnerability in Sharing API in Synology DiskStation Manager (DSM) before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 and 7.4-90075 allows remote authenticated users to write limited files when a victim clicks a sharing URL."}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 3.5, "baseSeverity": "LOW", "confidentialityImpact": "NONE", "integrityImpact": "LOW", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N", "version": "3.1"}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"cweId": "CWE-93", "description": "Improper Neutralization of CRLF Sequences ('CRLF Injection')", "lang": "en", "type": "CWE"}]}], "references": [{"name": "Synology-SA-26:13 DSM", "url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_13"}], "providerMetadata": {"orgId": "db201096-a0cc-46c7-9a55-61d9e221bf01", "shortName": "synology", "dateUpdated": "2026-09-18T08:22:29.078Z"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-09-18T19:10:49.926529Z", "id": "CVE-2026-13666", "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": "2026-09-18T19:11:08.435Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-13666", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-09-18T19:10:49.926529Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-09-18T19:10:55.897Z"}}], "cna": {"credits": [{"lang": "en", "type": "finder", "value": "Brendan O'Rourke"}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.5, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N", "integrityImpact": "LOW", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Synology", "product": "DiskStation Manager (DSM)", "versions": [{"status": "affected", "version": "7.4", "lessThan": "7.4-90075", "versionType": "semver"}, {"status": "affected", "version": "7.3.2", "lessThan": "7.3.2-86009-4", "versionType": "semver"}, {"status": "affected", "version": "7.2.2", "lessThan": "7.2.2-72806-9", "versionType": "semver"}, {"status": "affected", "version": "7.2.1", "lessThan": "7.2.1-69057-12", "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_13", "name": "Synology-SA-26:13 DSM"}], "descriptions": [{"lang": "en", "value": "An improper neutralization of CRLF sequences ('CRLF Injection') vulnerability in Sharing API in Synology DiskStation Manager (DSM) before 7.2.1-69057-12, 7.2.2-72806-9, 7.3.2-86009-4 and 7.4-90075 allows remote authenticated users to write limited files when a victim clicks a sharing URL."}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-93", "description": "Improper Neutralization of CRLF Sequences ('CRLF Injection')"}]}], "providerMetadata": {"orgId": "db201096-a0cc-46c7-9a55-61d9e221bf01", "shortName": "synology", "dateUpdated": "2026-09-18T08:22:29.078Z"}}}, "cveMetadata": {"cveId": "CVE-2026-13666", "state": "PUBLISHED", "dateUpdated": "2026-09-18T19:11:08.435Z", "dateReserved": "2026-06-29T10:30:40.284Z", "assignerOrgId": "db201096-a0cc-46c7-9a55-61d9e221bf01", "datePublished": "2026-09-18T08:22:29.078Z", "assignerShortName": "synology"}, "dataVersion": "5.2"}