CVE-2025-48700
Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability
Synacor·Zimbra Collaboration Suite (ZCS)
- Added
- Apr 20, 2026
- Fix due
- Apr 23, 2026
- Ransomware
- Not known
- Published
- Jun 23, 2025
- Updated
- Apr 21, 2026
- First covered
- Jul 10, 2026
- Latest story
- 4 months ago
Summary
An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0 and 10.0 and 10.1. A Cross-Site Scripting (XSS) vulnerability in the Zimbra Classic UI allows attackers to execute arbitrary JavaScript within the user's session, potentially leading to unauthorized access to sensitive information. This issue arises from insufficient sanitization of HTML content, specifically involving crafted tag structures and attribute values that include an @import directive and other script injection vectors. The vulnerability is triggered when a user views a crafted e-mail message in the Classic UI, requiring no additional user interaction.
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Attack profile
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NCISA 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.