CVE-2026-9491 PUBLISHED

Assigner: synology
Reserved: 25.05.2026 Published: 28.08.2026 Updated: 28.08.2026

A 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.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CVSS Score: 4.3

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

CVSS 3.1

Product Status

Vendor	Synology
Product	Synology Chat Server
Versions	Default: affected affected from * to 2.4.5-22148 (excl.)

Credits

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 finder

References

Synology-SA-26:10 Synology Chat Server

Problem Types

Server-Side Request Forgery (SSRF) CWE