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CVE-2025-68645

Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion

8.8 HIGHActively exploited (CISA KEV)EPSS 48.9%
  1. Published22 Dec 2025
  2. Added to CISA KEV22 Jan 2026
  3. Remediation due12 Feb 2026
Actively exploited (CISA KEV)

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 KEV: 22 Jan 2026Federal remediation due: 12 Feb 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionRequired
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected products

Synacor Zimbra Collaboration Suite≥ 10.0.0 < 10.0.18 · ≥ 10.1.0 < 10.1.13

Remediation

Fixed in
Synacor Zimbra Collaboration Suite≥ 10.0.18

References

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Frequently asked

Is CVE-2025-68645 being actively exploited?

Yes. CVE-2025-68645 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 22 Jan 2026.

How severe is CVE-2025-68645?

CVE-2025-68645 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 48.9% probability of exploitation.

Which products are affected by CVE-2025-68645?

Affected products include Synacor Zimbra Collaboration Suite.

How do I fix CVE-2025-68645?

Upgrade affected software to a fixed version, for example Synacor Zimbra Collaboration Suite 10.0.18 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-68645 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.