5.4

CVE-2025-27915

Warnung
Medienbericht
Exploit
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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Synacor ≫ Zimbra Collaboration Suite Version >= 10.0.0 < 10.0.13
Synacor ≫ Zimbra Collaboration Suite Version >= 10.1.0 < 10.1.5
Synacor ≫ Zimbra Collaboration Suite Version 9.0.0 Update -
Synacor ≫ Zimbra Collaboration Suite Version 9.0.0 Update p1
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Synacor ≫ Zimbra Collaboration Suite Version 9.0.0 Update p24.1
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07.10.2025: CISA Known Exploited Vulnerabilities (KEV) Catalog

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

Schwachstelle

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that 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 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.

Beschreibung

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Erforderliche Maßnahmen
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 3.92% 0.893
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
CISA-ADP 5.4 2.3 2.7
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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https://wiki.zimbra.com/wiki/Security_Center
Release Notes
https://wiki.zimbra.com/wiki/Zimbra_Releases/10.1.5#Security_Fixes
Release Notes
https://wiki.zimbra.com/wiki/Zimbra_Releases/10.0.13#Security_Fixes
Release Notes
https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P44#Security_Fixes
Release Notes
https://strikeready.com/blog/0day-ics-attack-in-the-wild/
Third Party Advisory
Exploit
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-27915
US Government Resource