Exploited Vulnerabilities DailyCVE-2025-66376: Synacor Zimbra Collaboration Suite (ZCS)
EPSS20.2%No. 1124 of 1739 in KEV
CVE year2025~1 yrs before listing
Same vendor in KEV19
Same product17
| Field | Value |
|---|---|
| Vendor | Synacor |
| Product | Zimbra Collaboration Suite (ZCS) |
| Name | Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability |
| Added to KEV | 2026-03-18 |
| US federal due date | 2026-04-01 |
| Ransomware use | Unknown |
| CWE | CWE-79 |
CISA 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.
Other entries for this product
| CVE | Vendor / product | Added | EPSS | Ransomware |
|---|---|---|---|---|
| CVE-2026-73570 | Synacor Zimbra Collaboration Suite (ZCS) | 2026-08-21 | 71.6% | Unknown |
| CVE-2025-48700 | Synacor Zimbra Collaboration Suite (ZCS) | 2026-04-20 | 1.7% | Unknown |
| CVE-2025-68645 | Synacor Zimbra Collaboration Suite (ZCS) | 2026-01-22 | 48.8% | Unknown |
| CVE-2025-27915 | Synacor Zimbra Collaboration Suite (ZCS) | 2025-10-07 | 4.0% | Unknown |
| CVE-2019-9621 | Synacor Zimbra Collaboration Suite (ZCS) | 2025-07-07 | 81.0% | Unknown |
| CVE-2024-27443 | Synacor Zimbra Collaboration Suite (ZCS) | 2025-05-19 | 23.6% | Unknown |
| CVE-2023-34192 | Synacor Zimbra Collaboration Suite (ZCS) | 2025-02-25 | 77.2% | Unknown |
| CVE-2024-45519 | Synacor Zimbra Collaboration Suite (ZCS) | 2024-10-03 | 99.9% | Unknown |
| CVE-2023-37580 | Synacor Zimbra Collaboration Suite (ZCS) | 2023-07-27 | 49.0% | Unknown |
| CVE-2022-27926 | Synacor Zimbra Collaboration Suite (ZCS) | 2023-04-03 | 17.6% | Unknown |
| CVE-2022-41352 | Synacor Zimbra Collaboration Suite (ZCS) | 2022-10-20 | 95.4% | Known |
| CVE-2022-37042 | Synacor Zimbra Collaboration Suite (ZCS) | 2022-08-11 | 91.8% | Known |
| CVE-2022-27925 | Synacor Zimbra Collaboration Suite (ZCS) | 2022-08-11 | 98.6% | Known |
| CVE-2022-27924 | Synacor Zimbra Collaboration Suite (ZCS) | 2022-08-04 | 93.9% | Known |
| CVE-2018-6882 | Synacor Zimbra Collaboration Suite (ZCS) | 2022-04-19 | 29.7% | Known |
Data from CISA's Known Exploited Vulnerabilities (KEV) catalog. EPSS is FIRST's estimated probability of exploitation activity in the next 30 days, refreshed weekly. Always follow the vendor's official guidance.
About this page
A Synacor Zimbra Collaboration Suite (ZCS) vulnerability added to CISA's Known Exploited Vulnerabilities catalog on 2026-03-18.