Medium severity · published Aug 28, 2026
CVE-2026-9548
An improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability in extract domain in Synology Chat Server before 2.4.5-22148 allows remote…
6.5
CVSS
0.3%
EPSS
No
On KEV
Description
An improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability in extract domain in Synology Chat Server before 2.4.5-22148 allows remote authenticated users, via a UI interaction, to read or write restricted files and conduct limited denial-of-service attacks in DSM.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
Required
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 19% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
SC
Synology Chat Server · Synology
before 2.4.5-22148 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-9548
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-9548
www.synology.com
https://www.synology.com/en-global/security/advisory/Synology_SA_26_10
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