An issue was discovered in Zimbra Collaboration (ZCS) 9.0 and 10.0 and 10.1. A stored cross-site scripting (XSS) vulnerability exists in the Classic Web Client due to insufficient sanitization of HTML content in ICS files. When a user views an e-mail message containing a malicious ICS entry, its embedded JavaScript executes via an ontoggle event inside a <details> tag.
This allows an attacker to run arbitrary JavaScript within the victim's session, potentially leading to unauthorized actions such as setting e-mail filters to redirect messages to an attacker-controlled address. As a result, an attacker can perform unauthorized actions on the victim's account, including e-mail redirection and data exfiltration.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
Required
User action required
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
None
No disruption
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 47
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
|
10.0.0
|
10.0.13
|
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*
|
10.1.0
|
10.1.5
|
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:-:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p1:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p10:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p11:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p12:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p13:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p14:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p15:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p16:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p17:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p18:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p19:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p2:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p20:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p21:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p22:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p23:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p24:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p24.1:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p25:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p26:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p27:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p28:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p29:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p3:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p30:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p31:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p32:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p33:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p34:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p35:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p36:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p37:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p38:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p39:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p4:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p40:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p41:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p42:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p43:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p5:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p6:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p7:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p8:*:*:*:*:*:*
|
— | — |
|
Synacor Zimbra_Collaboration_Suite
cpe:2.3:a:synacor:zimbra_collaboration_suite:9.0.0:p9:*:*:*:*:*:*
|
— | — |
References 6
https://wiki.zimbra.com/wiki/Security_Center
cve@mitre.org
https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.13#Security_Fixes
cve@mitre.org
https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.5#Security_Fixes
cve@mitre.org
https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P44#Security_Fixes
cve@mitre.org
https://strikeready.com/blog/0day-ics-attack-in-the-wild/
134c704f-9b21-4f2e-91b3-4a467353bcc0
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025…
134c704f-9b21-4f2e-91b3-4a467353bcc0