CVE-2026-40541

9.0 criticalEPSS 0.5%

Critical (9.0). EPSS 0.5% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.0 critical

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

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 42% of CVEs (scores of 2026-10-31)
CWE: CWE-79
Published: 2026-08-28
Modified: 2026-09-01
Record from: the NVD, synced 2026-10-19

References

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

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