CVE-2026-9491

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-9491
StatePUBLISHED
Assignersynology
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 08:16:58 UTC
Updated2026-08-28 12:16:39 UTC
DescriptionA server-ide request forgery (SSRF) vulnerability in webhook in Synology Chat Server before 2.4.5-22148 allows remote authenticated users to obtain non-sensitive information.

Risk And Classification

Primary CVSS: v3.1 4.3 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

EPSS: 0.004000000 probability, percentile 0.331540000 (date 2026-09-03)

Problem Types: CWE-918 | CWE-918 Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.1CNACVSS4.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Synology Synology Chat Server affected * 2.4.5-22148 semver Not specified

References

ReferenceSourceLinkTags
www.synology.com/en-global/security/advisory/Synology_SA_26_10 [email protected] www.synology.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Lam Jun Rong and Javier Koh, Cyber Specialists of the Digital and Intelligence Service (DIS) working with the Centre for Strategic Infocomm Technologies (CSIT) and Dr Joseph Teo, CSIT (en)

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