Live › vulnerability › CVE-2025-66376
Go to dashboardZimbra Collaboration Suite's Classic UI has a cross-site scripting flaw: CSS @import directives inside email HTML are abused to run script. An attacker who gets a crafted email in front of a user can run script in that user's Zimbra session, which can expose mail and session data.
Summary written from the sources below. Check the originals before acting.
First seen by InfraStack 2026-10-23 19:11 UTC, 5h before NVD. All times on this page are UTC.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
| Product | Ecosystem | Affected | Fixed in |
|---|---|---|---|
| Synacor Zimbra Collaboration Suite (ZCS) | vendor | – | – |
| synacor zimbra collaboration suite | vendor | >= 10.0.0, < 10.0.18 | 10.0.18 |
| synacor zimbra collaboration suite | vendor | >= 10.1.0, < 10.1.13 | 10.1.13 |
Unknown from the sources.
Each row is the first time that source carried this signal. The analyst’s rows are its own findings.
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.
CISA 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.
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