CVE-2025-48700

MEDIUM CISA KEV

Published Jun 23, 2025 Modified Apr 21, 2026 CWE-79

Description

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.

CVSS v3.1 Score

6.1

MEDIUM

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

CISA Known Exploited Vulnerability

This vulnerability is actively exploited in the wild.

Added: Apr 20, 2026 Remediation due: Apr 23, 2026

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
synacor	zimbra_collaboration_suite	10.0.0 — 10.0.12
synacor	zimbra_collaboration_suite	10.1.0 — 10.1.4
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All
synacor	zimbra_collaboration_suite	All

References

Advisories & Patches

https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

Other References

https://wiki.zimbra.com/wiki/Security_Center https://wiki.zimbra.com/wiki/Zimbra_Responsible_Disclosure_Policy https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-48700

Frequently Asked Questions

What is CVE-2025-48700? +

How severe is CVE-2025-48700? +

CVE-2025-48700 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-48700? +

CVE-2025-48700 affects products from synacor, specifically: zimbra_collaboration_suite. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-48700? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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