PoC Index

CVE-2025-27915

KEVMEDIUM 5.4EPSS 3.9%

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.

CVSS v3.1
5.4 MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
EPSS
3.92% chance of exploitation in the next 30 days, 90th percentile
CISA KEV
added 2025-10-07
Nuclei
medium · CWE-79
Published
2025-03-12
Updated
2026-02-26

Proof-of-concept exploits (1)

Nuclei templates (1)

References

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