CVE-2025-68645
HighExploitedPublic exploitA 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.
Published Dec 22, 2025 · Updated Sep 14, 2026
Key Facts
Patch immediately- CVE-2025-68645 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Zimbra Collaboration Suite (Synacor).
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 14, 2026. Public exploit code is available.
- EPSS estimates a 49% probability of exploitation in the next 30 days.
- Fixed versions are available, including Zimbra Collaboration Suite 10.0.18.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
49%
Higher than 98.8% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2025-68645 brief as a PDF
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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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jan 22, 2026 | Feb 12, 2026 | Not reported |
| Industry KEV feed | Jan 14, 2026 | Feb 12, 2026 | Not reported |
| CIRCL KEV | Jan 14, 2026 | Feb 12, 2026 | Not reported |
| ENISA EUVD | Jan 22, 2026 | n/a | Not reported |
Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Affected Products
1 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| Zimbra Collaboration SuiteSynacor | See advisory | 10.0.18 |
Patched Releases
Zimbra Collaboration Suite
10.0.18
Timeline
Publicly disclosed
Dec 22, 2025
Added to Industry KEV feed
Jan 14, 2026
Added to CIRCL KEV
Jan 14, 2026
Added to CISA KEV
Jan 22, 2026
Added to ENISA EUVD
Jan 22, 2026
Last updated
Sep 14, 2026
Weakness Type
- CWE-98 Improper Control of Filename for Include/Require Statement in PHP Program ('PHP Remote File Inclusion')
References
- advisoryhttps://github.com/CVEProject/cvelistV5/tree/main/cves/2025/68xxx/CVE-2025-68645.json
- advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2025-68645
- advisoryhttps://wiki.zimbra.com/wiki/Security_Center
- exploitVulnCheck exploitation report
- exploitVulnCheck exploitation report
FAQ
Common Questions.
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.
Affected: Zimbra Collaboration Suite (Synacor). The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Jan 14, 2026.
Yes. It was added on Jan 22, 2026 with a federal remediation due date of Feb 12, 2026.
Public exploit code is available.
Fixed versions are available, including Zimbra Collaboration Suite 10.0.18.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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