{"uuid": "ff5628bd-87ca-43c5-b5a5-913f4b95503c", "vulnerability": {"vulnId": "CVE-2025-66376", "altId": []}, "gcve": {"origin_uuid": "405284c2-e461-4670-8979-7fd2c9755a60", "object_uuid": "ff5628bd-87ca-43c5-b5a5-913f4b95503c"}, "status": {"exploited": true, "status_reason": "confirmed", "status_updated_at": "2026-03-18T00:00:00+00:00"}, "characteristics": {}, "timestamps": {"asserted_at": "2026-03-18T00:00:00Z", "recorded_at": "2026-03-18T18:00:01Z", "first_seen_at": "2026-03-18T00:00:00Z"}, "scope": {"notes": "KEV entry: Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability | Affected: Synacor / Zimbra Collaboration Suite (ZCS) | Description: Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability in the Classic UI where attackers could abuse Cascading Style Sheets (CSS) @import directives in email HTML. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-04-01 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2025-66376"}, "evidence": [{"type": "vendor_report", "source": "cisa-kev", "signal": "successful_exploitation", "confidence": 0.8, "details": {"cwes": ["CWE-79"], "feed": "CISA Known Exploited Vulnerabilities Catalog", "product": "Zimbra Collaboration Suite (ZCS)", "due_date": "2026-04-01", "date_added": "2026-03-18", "vendorProject": "Synacor", "vulnerabilityName": "Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability", "knownRansomwareCampaignUse": "Unknown"}}], "references": [{"id": "CVE-2025-66376", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-66376"}]}