CVE-2026-9491

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-28 · updated 2026-09-01
Weakness: CWE-918

Description

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.

Affected products

Synology Chat Server: before 2.4.5-22148 — fixed in 2.4.5-22148

How to fix

Upgrade to a fixed version: Synology Chat Server 2.4.5-22148. Check the vendor advisory for mitigations.

References

https://www.synology.com/en-global/security/advisory/Synology_SA_26_10

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