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 114 days.
EPSS puts exploitation in the next 30 days at 2%.
Public exploit code: none found in monitored sources.
Which products and versions are affected?
No affected package list recorded here yet.
Is there a patch?
No patch identifier recorded here yet.
What PlainSec published about CVE-2025-48700
PlainSec has not published a story about this CVE.