CVE-2026-40541 — CRITICAL (9.0)

Vulnerability 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 arbitrary files and conduct denial-of-service attacks in DSM.

CVSS Score

9.0

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

REQUIRED

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-79

References

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

FAQ

What is CVE-2026-40541?

CVE-2026-40541 is a vulnerability with a CVSS score of 9.0 (CRITICAL). 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, vi...

How severe is CVE-2026-40541?

CVE-2026-40541 has been rated CRITICAL with a CVSS base score of 9.0/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-40541?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.