MEDIUM CISA KEV

CVE-2025-27915

CVSS v3

5.4

MEDIUM

EPSS Score

4.1 %

exploit probability, as of 2026-10-20

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

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Affected and fixed versions

Neither OSV.dev nor the vendor advisories we read list affected versions for CVE-2025-27915 yet.

Full record on NVD

Description

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.

CISA Known Exploited Vulnerability

Date Added: 2025-10-07
Patch Due Date: 2025-10-28
Ransomware Use: Unknown

Technical details

Published: 2025-03-12

Frequently asked questions

What is CVE-2025-27915?

Is CVE-2025-27915 actively exploited?

Yes. CVE-2025-27915 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2025-10-28.

What is the CVSS score for CVE-2025-27915?

CVE-2025-27915 has a CVSS v3 base score of 5.4 (MEDIUM severity).

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