Vulnerability · Published Aug 28, 2026 · Assigned by synology
CVE-2026-9491
Medium 4.3
In plain English
A medium-severity server-side request forgery in Synology Chat Server from Synology. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities).
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.4%top 70.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Synology | Synology Chat Server | * – before 2.4.5-22148 |
Weakness: CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
References
- Synology-SA-26:10 Synology Chat Server vendor-advisory