CVE-2026-40541

{"id": "CVE-2026-40541", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-40541", "role": "CISA Coordinator", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-08-28T11:31:57.261097Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security@synology.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.0, "attackVector": "NETWORK", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.3}]}, "affected": [{"source": "security@synology.com", "affectedData": [{"vendor": "Synology", "product": "Synology Chat Server", "versions": [{"status": "affected", "version": "*", "lessThan": "2.4.5-22148", "versionType": "semver"}], "defaultStatus": "affected"}]}], "published": "2026-08-28T08:16:40.713", "references": [{"url": "https://www.synology.com/en-global/security/advisory/Synology_SA_26_10", "source": "security@synology.com"}], "vulnStatus": "Undergoing Analysis", "weaknesses": [{"type": "Secondary", "source": "security@synology.com", "description": [{"lang": "en", "value": "CWE-79"}]}], "descriptions": [{"lang": "en", "value": "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."}], "lastModified": "2026-09-01T20:54:51.287", "sourceIdentifier": "security@synology.com"}