Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability. Actively exploited: CISA added this vulnerability to its Known Exploited Vulnerabilities catalog on 22/01/2026. Patch affected systems as an emergency.
| Package | Affected versions | Patched versions |
|---|---|---|
| zimbra collaboration suite | ≥ 10.0.0, < 10.0.18≥ 10.1.0, < 10.1.13 | 10.0.1810.1.13 |
A Local File Inclusion (LFI) vulnerability exists in the Webmail Classic UI of Zimbra Collaboration (ZCS) 10.0 and 10.1 because of improper handling of user-supplied request parameters in the RestFilter servlet. An unauthenticated remote attacker can craft requests to the /h/rest endpoint to influence internal request dispatching, allowing inclusion of arbitrary files from the WebRoot directory.
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