# CVE-2025-27915: A Synacor Zimbra Collaboration Suite (ZCS) bug is being used in attacks

Status: Being used now (CISA KEV, added 2025-10-07)
Who: 
Do this: 

## Agent prompt (read-only)
Read-only check, change nothing, send nothing anywhere.
Is Synacor Zimbra Collaboration Suite (ZCS) (CVE-2025-27915) installed or running on this machine or in this project?
1. Find every copy and its version (apps, packages, containers, lockfiles).
2. Compare each version against the vendor's fixed version for CVE-2025-27915. Quote the vendor page you used.
3. Report a table: where, version, fixed version, status (exposed / fixed / not installed / unsure).
4. List the exact update steps, but do not run them.

## Official description
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.

## Sources
- https://wiki.zimbra.com/wiki/Security_Center
- https://nvd.nist.gov/vuln/detail/CVE-2025-27915
- https://nvd.nist.gov/vuln/detail/CVE-2025-27915

Generated by isitexploited.org from public sources. Verify version numbers against the vendor before acting.