CVE-2025-27915

CVE-2025-27915 is actively exploited and listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added October 7, 2025. EIP tracks 1 public exploit from researchers including HORKimhab. A Nuclei detection template is also available.

AI-analyzed exploit summary The repository contains a markdown file describing CVE-2025-27915, a stored XSS vulnerability in Zimbra Collaboration (ZCS) 9.0, 10.0, and 10.1. The writeup explains the root cause (insufficient HTML sanitization in ICS files) and attack vector (malicious JavaScript in ontoggle events), but no functional exploit code is provided.

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.