CVE-2025-48700: Synacor Zimbra Collaboration Suite (ZCS) Cross-site Scripting Vulnerability

Published Jun 23, 2025
·
Updated

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.

Other sources

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that could allow attackers to execute arbitrary JavaScript within the user's session, potentially leading to unauthorized access to sensitive information.

— CISA

Affected Software

96 affected components
Zimbra Collaboration (ZCS)>=8.8.15<=10.1
Synacor Zimbra Collaboration Suite>=10.0.0<10.0.12
Synacor Zimbra Collaboration Suite>=10.1.0<10.1.4
Synacor Zimbra Collaboration Suite=8.8.15
Synacor Zimbra Collaboration Suite=8.8.15-p1
Synacor Zimbra Collaboration Suite=8.8.15-p10
Synacor Zimbra Collaboration Suite=8.8.15-p11
Synacor Zimbra Collaboration Suite=8.8.15-p12
Synacor Zimbra Collaboration Suite=8.8.15-p13
Synacor Zimbra Collaboration Suite=8.8.15-p14
Synacor Zimbra Collaboration Suite=8.8.15-p15
Synacor Zimbra Collaboration Suite=8.8.15-p16
Synacor Zimbra Collaboration Suite=8.8.15-p17
Synacor Zimbra Collaboration Suite=8.8.15-p18
Synacor Zimbra Collaboration Suite=8.8.15-p19
Synacor Zimbra Collaboration Suite=8.8.15-p2
Synacor Zimbra Collaboration Suite=8.8.15-p20
Synacor Zimbra Collaboration Suite=8.8.15-p21
Synacor Zimbra Collaboration Suite=8.8.15-p22
Synacor Zimbra Collaboration Suite=8.8.15-p23
Synacor Zimbra Collaboration Suite=8.8.15-p24
Synacor Zimbra Collaboration Suite=8.8.15-p25
Synacor Zimbra Collaboration Suite=8.8.15-p26
Synacor Zimbra Collaboration Suite=8.8.15-p27
Synacor Zimbra Collaboration Suite=8.8.15-p28
Synacor Zimbra Collaboration Suite=8.8.15-p29
Synacor Zimbra Collaboration Suite=8.8.15-p3
Synacor Zimbra Collaboration Suite=8.8.15-p30
Synacor Zimbra Collaboration Suite=8.8.15-p31
Synacor Zimbra Collaboration Suite=8.8.15-p31.1
Synacor Zimbra Collaboration Suite=8.8.15-p32
Synacor Zimbra Collaboration Suite=8.8.15-p33
Synacor Zimbra Collaboration Suite=8.8.15-p34
Synacor Zimbra Collaboration Suite=8.8.15-p35
Synacor Zimbra Collaboration Suite=8.8.15-p36
Synacor Zimbra Collaboration Suite=8.8.15-p37
Synacor Zimbra Collaboration Suite=8.8.15-p38
Synacor Zimbra Collaboration Suite=8.8.15-p39
Synacor Zimbra Collaboration Suite=8.8.15-p4
Synacor Zimbra Collaboration Suite=8.8.15-p40
Synacor Zimbra Collaboration Suite=8.8.15-p41
Synacor Zimbra Collaboration Suite=8.8.15-p42
Synacor Zimbra Collaboration Suite=8.8.15-p43
Synacor Zimbra Collaboration Suite=8.8.15-p44
Synacor Zimbra Collaboration Suite=8.8.15-p45
Synacor Zimbra Collaboration Suite=8.8.15-p46
Synacor Zimbra Collaboration Suite=8.8.15-p5
Synacor Zimbra Collaboration Suite=8.8.15-p6
Synacor Zimbra Collaboration Suite=8.8.15-p7
Synacor Zimbra Collaboration Suite=8.8.15-p8
Synacor Zimbra Collaboration Suite=8.8.15-p9
Synacor Zimbra Collaboration Suite=9.0.0
Synacor Zimbra Collaboration Suite=9.0.0-p1
Synacor Zimbra Collaboration Suite=9.0.0-p10
Synacor Zimbra Collaboration Suite=9.0.0-p11
Synacor Zimbra Collaboration Suite=9.0.0-p12
Synacor Zimbra Collaboration Suite=9.0.0-p13
Synacor Zimbra Collaboration Suite=9.0.0-p14
Synacor Zimbra Collaboration Suite=9.0.0-p15
Synacor Zimbra Collaboration Suite=9.0.0-p16
Synacor Zimbra Collaboration Suite=9.0.0-p17
Synacor Zimbra Collaboration Suite=9.0.0-p18
Synacor Zimbra Collaboration Suite=9.0.0-p19
Synacor Zimbra Collaboration Suite=9.0.0-p2
Synacor Zimbra Collaboration Suite=9.0.0-p20
Synacor Zimbra Collaboration Suite=9.0.0-p21
Synacor Zimbra Collaboration Suite=9.0.0-p22
Synacor Zimbra Collaboration Suite=9.0.0-p23
Synacor Zimbra Collaboration Suite=9.0.0-p24
Synacor Zimbra Collaboration Suite=9.0.0-p24.1
Synacor Zimbra Collaboration Suite=9.0.0-p25
Synacor Zimbra Collaboration Suite=9.0.0-p26
Synacor Zimbra Collaboration Suite=9.0.0-p27
Synacor Zimbra Collaboration Suite=9.0.0-p28
Synacor Zimbra Collaboration Suite=9.0.0-p29
Synacor Zimbra Collaboration Suite=9.0.0-p3
Synacor Zimbra Collaboration Suite=9.0.0-p30
Synacor Zimbra Collaboration Suite=9.0.0-p31
Synacor Zimbra Collaboration Suite=9.0.0-p32
Synacor Zimbra Collaboration Suite=9.0.0-p33
Synacor Zimbra Collaboration Suite=9.0.0-p34
Synacor Zimbra Collaboration Suite=9.0.0-p35
Synacor Zimbra Collaboration Suite=9.0.0-p36
Synacor Zimbra Collaboration Suite=9.0.0-p37
Synacor Zimbra Collaboration Suite=9.0.0-p38
Synacor Zimbra Collaboration Suite=9.0.0-p39
Synacor Zimbra Collaboration Suite=9.0.0-p4
Synacor Zimbra Collaboration Suite=9.0.0-p40
Synacor Zimbra Collaboration Suite=9.0.0-p41
Synacor Zimbra Collaboration Suite=9.0.0-p42
Synacor Zimbra Collaboration Suite=9.0.0-p5
Synacor Zimbra Collaboration Suite=9.0.0-p6
Synacor Zimbra Collaboration Suite=9.0.0-p7
Synacor Zimbra Collaboration Suite=9.0.0-p8
Synacor Zimbra Collaboration Suite=9.0.0-p9
Synacor Zimbra Collaboration Suite (ZCS)

Event History

Jun 23, 2025
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
Description
Data Sourced
via NVD·03:15 PM
DescriptionSeverityWeaknessAffected Software
Apr 20, 2026
Known Exploited
via CISA·12:00 AM
Data Sourced
via CISA·12:00 AM
RemedyDescriptionAffected Software
Apr 24, 2026
News Published
via BleepingComputer·01:35 PM
News Published
via BleepingComputer·01:37 PM
Jul 10, 2026
News Published
via BleepingComputer·11:47 AM
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Frequently Asked Questions

1

What is the severity of CVE-2025-48700?

CVE-2025-48700 has been classified as a high severity Cross-Site Scripting (XSS) vulnerability.

2

How do I fix CVE-2025-48700?

To remediate CVE-2025-48700, update Zimbra Collaboration to the latest patched version.

3

Which versions of Zimbra Collaboration are affected by CVE-2025-48700?

CVE-2025-48700 affects Zimbra Collaboration versions 8.8.15 through 10.1.

4

What type of vulnerability is CVE-2025-48700?

CVE-2025-48700 is a Cross-Site Scripting (XSS) vulnerability.

5

What can an attacker do with CVE-2025-48700?

An attacker exploiting CVE-2025-48700 can execute arbitrary JavaScript within a user's session, potentially accessing sensitive information.

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