CVE-2025-66376
Cross-site Scripting — is CVE-2025-66376real, exploitable, or a false positive? Here's the community ground truth.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Zimbra Collaboration (ZCS) 10 before 10.0.18 and 10.1 before 10.1.13 allows Classic UI stored XSS via Cascading Style Sheets (CSS) @import directives in an HTML e-mail message.
References
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Field notes & remediation
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- 0
Synacor Zimbra Collaboration Suite (ZCS) Cross-Site Scripting Vulnerability — 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. Listed in the CISA KEV catalog (added 2026-03-18) — confirmed exploited in the wild, not theoretical. FIRST EPSS puts the chance of exploitation in the next 30 days at ~12%. Treat it as real and prioritize remediation over triage.
- 0
Required action for Synacor Zimbra Collaboration Suite (ZCS): Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. CISA set a federal remediation due date of 2026-04-01. After patching, verify the vulnerable path is no longer reachable before closing the finding.
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