Paper/Archive/CVE-2026-40541

CVE-2026-40541

Synology Synology Chat Server — An improper neutralization of input during web page generation ('Cross-site Scripting') vulnerability in extract domain in Synology Chat…

EPSS 0.5%CVSS 9.0

critical.is priorityof 100

CVSS 9.0 (CNA)9.0 / 10 × 3027.0 Not in CISA KEV+300.0 EPSS percentile 42.4.424 × 208.5 No public exploit+100.0 SSVC exploitation: none+100.0

Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource

Synology Chat Server< 2.4.5-221482.4.5-22148CNA

Scores by source

synology (CNA)9.0CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H

CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

advisorysynology.com/en-global/security/advisory/Synology_SA_26_10