CVE-2025-48700 · CVSS 6.1 MEDIUM · EPSS 2% · KEV 2026-04-20 · patch available
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.
Is CVE-2025-48700 exploited?
Listed in the CISA KEV catalog on 2026-04-20.
Federal remediation due 2026-04-23.
Past that date by 190 days.
EPSS puts exploitation in the next 30 days at 2%.
Public exploit code: none found in monitored sources.