#Zimbra

› Synacor Zimbra Collaboration Suite (ZCS) ✓patched

Zimbra Collaboration Suite (ZCS) contains an OS command injection vulnerability which could allow an unauthenticated attacker to send specially crafted SMTP requests that may result in execution of arbitrary operating system commands as the Zimbra user. Added to CISA KEV on 2026-08-21.

› Synacor Zimbra Collaboration Suite (ZCS) ✓patched

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability that could allow attackers to execute arbitrary JavaScript within the user's session, potentially leading to unauthorized access to sensitive information. Added to CISA KEV on 2026-04-20.

› Synacor Zimbra Collaboration Suite (ZCS) ✓patched

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability in the Classic UI where attackers could abuse Cascading Style Sheets (CSS) @import directives in email HTML. Added to CISA KEV on 2026-03-18.

› Synacor Zimbra Collaboration Suite (ZCS) ✓patched

Synacor Zimbra Collaboration Suite (ZCS) contains a PHP remote file inclusion vulnerability that could allow for remote attackers to craft requests to the /h/rest endpoint to influence internal request dispatching, allowing inclusion of arbitrary files from the WebRoot directory. Added to CISA KEV on 2026-01-22.

› Synacor Zimbra Collaboration Suite (ZCS) ✓patched

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. Added to CISA KEV on 2025-10-07.

› Synacor Zimbra Collaboration Suite (ZCS) ✓patched

Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery (SSRF) vulnerability via the ProxyServlet component. Added to CISA KEV on 2025-07-07.

› Synacor Zimbra Collaboration Suite (ZCS) ✓patched

Zimbra Collaboration contains a cross-site scripting (XSS) vulnerability in the CalendarInvite feature of the Zimbra webmail classic user interface. An attacker can exploit this vulnerability via an email message containing a crafted calendar header, leading to the execution of arbitrary JavaScript code. Added to CISA KEV on 2025-05-19.

› Synacor Zimbra Collaboration Suite (ZCS) ✓patched

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting (XSS) vulnerability that allows a remote authenticated attacker to execute arbitrary code via a crafted script to the /h/autoSaveDraft function. Added to CISA KEV on 2025-02-25.

› Synacor Zimbra Collaboration Suite (ZCS) ✓patched

Synacor Zimbra Collaboration Suite (ZCS) contains an unspecified vulnerability in the postjournal service that may allow an unauthenticated user to execute commands. Added to the CISA KEV catalog on 2024-10-03.

› Synacor Zimbra Collaboration Suite (ZCS) ✓patched

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability impacting the confidentiality and integrity of data. Added to CISA KEV on 2023-07-27.

› Synacor Zimbra Collaboration Suite (ZCS) ✓patched

Synacor Zimbra Collaboration Suite (ZCS) contains a cross-site scripting vulnerability by allowing an endpoint URL to accept parameters without sanitizing. Added to CISA KEV on 2023-04-03.