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Synacor

Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability

CVE-2025-68645

What this means

This is rated high severity (8.8 out of 10). It is on the known-exploited catalogue, which means attacks using it have already been seen. Ask IT whether Synacor Zimbra Collaboration Suite is in your estate, and treat that as the priority.

Full vendor 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.

Scoring and exploitation

8.8/ 10
CVSS 3.1 base scoreHigh

Exploitable over the network without any account, but only if a user takes an action, such as opening a file or link. High impact on confidentiality, integrity and availability.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitability

Longer bar: easier to attack

Attack vectorNetworkAV:N
Attack complexityLowAC:L
Privileges requiredNonePR:N
User interactionRequiredUI:R
ScopeUnchangedS:U

Impact

Longer bar: more harm

ConfidentialityHighC:H
IntegrityHighI:H
AvailabilityHighA:H
Elevated attack likelihood (~50.6% in 30 days)Model estimate (): a probability signal, not confirmed exploitation
Exploited in the wild
Yes — confirmed exploitation (US CISA )
Not reported
Listed product
Synacor Zimbra Collaboration Suite (ZCS)

Weaknesses

CWE-98

Affected products ()

  • Synacor Zimbra Collaboration Suite
Show the raw CPE strings (1)
  • cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*

References

3 links from the CVE record, grouped by site; the vendor's advisory comes first.

Related feed events

  • Synacor Zimbra Collaboration Suite (ZCS) PHP Remote File Inclusion Vulnerability

    Type Vulnerability

    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…

    Next step: Confirm whether Synacor Zimbra Collaboration Suite (ZCS) is in your estate.

    Who's reporting

    1 of 3 perspectives

    Official authority: Official 1Vendor statement missing. no VendorResearcher coverage missing. no Researcher1 signal

    Only official coverage so far. Treat as an early signal.

    Synacor Zimbra Collaboration Suite (ZCS)
    CVE-2025-68645