CVE-2025-48700 - Synacor Zimbra Collaboration Suite (ZCS)
AI Vulnerability ContextAn 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...
Overview
A source-backed snapshot of this vulnerability.
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.
Vulnerability status
How serious this vulnerability is and whether it is known to be exploited.
- CVE ID
- CVE-2025-48700
- Vendor/project
- Synacor
- Product
- Zimbra Collaboration Suite (ZCS)
- Vulnerability name
- Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability
- Date added
- 2026-04-20
- Due date
- 2026-04-23
- Known ransomware campaign use
- Unknown
- CVSS v3
- 6.1
Exploit context
What the vulnerability is about.
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.
Source evidence
Original public records and references for this page.
Original source
Original source links
Open the public records and source datasets used for this page.