MSRXCVE-2025-48700
CVE-2025-48700
Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CVSS 3.1 · CNA
chance of exploitation in the next 30 days (EPSS; higher than 77% of CVEs)
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.
Scores
Affected products
- synacor zimbra collaboration suite: ≥ 10.0.0, < 10.0.12; ≥ 10.1.0, < 10.1.4; 92 specific releases listed in NVD
Weakness: CWE-79
4 references (advisories, patches, write-ups)
- https://wiki.zimbra.com/wiki/Security_Center · Release Notes
- https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy · Product
- https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories · Vendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-48700 · US Government Resource
Sources: NVD, CVE.org, OSV.dev, FIRST EPSS. Missing ones did not answer or have no record yet.