Vulnerability Details CVE-2025-27915
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 19.8%
CVSS Severity
CVSS v3 Score 5.4
References
Products affected by CVE-2025-27915
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cpe:2.3:a:zimbra:collaboration:10.0.0
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cpe:2.3:a:zimbra:collaboration:10.0.1
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cpe:2.3:a:zimbra:collaboration:10.0.10
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cpe:2.3:a:zimbra:collaboration:10.0.11
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cpe:2.3:a:zimbra:collaboration:10.0.12
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cpe:2.3:a:zimbra:collaboration:10.0.2
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cpe:2.3:a:zimbra:collaboration:10.0.3
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cpe:2.3:a:zimbra:collaboration:10.0.4
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cpe:2.3:a:zimbra:collaboration:10.0.5
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cpe:2.3:a:zimbra:collaboration:10.0.6
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cpe:2.3:a:zimbra:collaboration:10.0.7
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cpe:2.3:a:zimbra:collaboration:10.0.8
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cpe:2.3:a:zimbra:collaboration:10.0.9
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cpe:2.3:a:zimbra:collaboration:10.1.0
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cpe:2.3:a:zimbra:collaboration:10.1.1
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cpe:2.3:a:zimbra:collaboration:10.1.2
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cpe:2.3:a:zimbra:collaboration:10.1.3
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cpe:2.3:a:zimbra:collaboration:10.1.4
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cpe:2.3:a:zimbra:collaboration:9.0.0