How severe is CVE-2025-68645?

CVE-2025-68645 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-68645 being actively exploited?

Yes. CVE-2025-68645 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-01-22, which means active exploitation has been confirmed. It should be prioritised for remediation.

What products are affected by CVE-2025-68645?

CVE-2025-68645 affects Synacor Zimbra Collaboration Suite. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-68645?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.

Does CVE-2025-68645 have an EU (EUVD) identifier?

Yes. CVE-2025-68645 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204719. It is also flagged as exploited in the EUVD (since 2026-01-22).

When was CVE-2025-68645 published?

CVE-2025-68645 was published on 2025-12-22 and last updated on 2026-06-17.

CVE-2025-68645

CVE-2025-68645 is a high-severity vulnerability in Synacor Zimbra Collaboration Suite with a CVSS 3.x base score of 8.8. It is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, confirming it has been exploited in the wild (added 2026-01-22). The underlying weakness is classified as CWE-98.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 32% (98th percentile)
Actively exploited: Yes — listed in CISA KEV (added 2026-01-22)
EU (EUVD) id: EUVD-2025-204719
EU exploitation: Flagged exploited in the ENISA EU Vulnerability Database (since 2026-01-22)
Weakness: CWE-98
Affected product: Synacor Zimbra Collaboration Suite
Published: 2025-12-22
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2025-68645?: 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.
How severe is CVE-2025-68645?: CVE-2025-68645 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-68645 being actively exploited?: Yes. CVE-2025-68645 is on CISA's Known Exploited Vulnerabilities (KEV) catalog, added on 2026-01-22, which means active exploitation has been confirmed. It should be prioritised for remediation.
What products are affected by CVE-2025-68645?: CVE-2025-68645 affects Synacor Zimbra Collaboration Suite. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-68645?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Because this CVE is known to be actively exploited, treat remediation as urgent — CISA KEV typically sets a short remediation deadline.
Does CVE-2025-68645 have an EU (EUVD) identifier?: Yes. CVE-2025-68645 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-204719. It is also flagged as exploited in the EUVD (since 2026-01-22).
When was CVE-2025-68645 published?: CVE-2025-68645 was published on 2025-12-22 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:synacor:zimbra_collaboration_suite:*:*:*:*:*:*:*:*

More vulnerabilities in Synacor Zimbra Collaboration Suite

CVE-2024-45519 — Critical (CVSS 10.0): The postjournal service in Zimbra Collaboration (ZCS) before 8.8.15 Patch 46, 9 before 9.0.0 Patch 41, 10 before…
CVE-2022-41352 — Critical (CVSS 9.8): An issue was discovered in Zimbra Collaboration (ZCS) 8.8.15 and 9.0. An attacker can upload arbitrary files through…
CVE-2022-37042 — Critical (CVSS 9.8): Zimbra Collaboration Suite (ZCS) 8.8.15 and 9.0 has mboximport functionality that receives a ZIP archive and extracts…
CVE-2020-7796 — Critical (CVSS 9.8): Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 allows SSRF when WebEx zimlet is installed and zimlet JSP is…
CVE-2019-9670 — Critical (CVSS 9.8): mailboxd component in Synacor Zimbra Collaboration Suite 8.7.x before 8.7.11p10 has an XML External Entity injection…
CVE-2019-6980 — Critical (CVSS 9.8): Synacor Zimbra Collaboration Suite 8.7.x through 8.8.11 allows insecure object deserialization in the IMAP component.

All CVEs affecting Synacor Zimbra Collaboration Suite →

Other CWE-98 (PHP Remote File Inclusion) vulnerabilities

CVE-2025-25174 — Critical (CVSS 10.0): Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion') vulnerability…
CVE-2012-10025 — Critical (CVSS 10.0): The WordPress plugin Advanced Custom Fields (ACF) version 3.5.1 and below contains a remote file inclusion (RFI)…
CVE-2026-41228 — Critical (CVSS 9.9): Froxlor is open source server administration software. Prior to version 2.3.6, the Froxlor API endpoint…
CVE-2025-31340 — Critical (CVSS 9.9): A improper control of filename for include/require statement in PHP program vulnerability in the retrieve course…
CVE-2023-5199 — Critical (CVSS 9.9): The PHP to Page plugin for WordPress is vulnerable Local File Inclusion to Remote Code Execution in versions up to, and…
CVE-2026-7515 — Critical (CVSS 9.8): The BetterDocs Pro plugin for WordPress is vulnerable to Local File Inclusion in versions up to, and including, 3.8.0…

Browse all CWE-98 (PHP Remote File Inclusion) vulnerabilities →