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CVE-2025-48700

6.1
MEDIUMCVSS v3.1 Base Score
18.19%
LOW RiskEPSS (95th percentile)
KEV

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.

Published: 6/23/2025
Modified: 4/21/2026
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ACTIVELY EXPLOITED IN THE WILD

This vulnerability is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability Name:

Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability

Vendor / Product:

Synacor Zimbra Collaboration Suite (ZCS)

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.

Due Date: 4/23/2026(OVERDUE)
Added to KEV:

4/20/2026

Notes:

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories ; https://nvd.nist.gov/vuln/detail/CVE-2025-48700

Vulnerability Summary

CVSS v3 Score

6.1MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Score (Exploitation Probability)

18.19%LOW Exploitation Risk
95th percentile

This vulnerability has a 18.19% probability of being exploited in the next 30 days, ranking higher than 95% of all scored CVEs.

CWE Classification

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Same Weakness Type(CWE-79)

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