Vulnerability report

Exploitation Attempts Observed in the Wild High Confidence Not in CISA KEV

CVE-2026-112357

GFI KerioConnect KOFF < 10.0.9p2 Privilege Escalation

GFI USA / GFI KerioConnect · affected before 10.0.9p2

Watch CVE-2026-112357 Browse KEV feed
Severity
CVSS 8.5 · High
Confidence
High
Exploit status
Exploitation Attempts Observed in the Wild
EPSS
—
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-112357 is GFI KerioConnect KOFF < 10.0.9p2 Privilege Escalation. GFI KerioConnect (Kerio Connect) Outlook Connector (Offline Edition), 'KOFF', before 10.0.9 Patch 2 contains a local privilege escalation...

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Also reported by third-party sources. Confidence is high.

Who is affected?

GFI USA / GFI KerioConnect affected before 10.0.9p2.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

GFI KerioConnect KOFF < 10.0.9p2 Privilege Escalation

GFI KerioConnect (Kerio Connect) Outlook Connector (Offline Edition), 'KOFF', before 10.0.9 Patch 2 contains a local privilege escalation vulnerability caused by weak installer permissions that leave the product directory writable by the built-in Users group.

A local non-administrative attacker can replace the searchd.exe service binary used by the bundled KOFFIndexingService, which runs as LocalSystem, to execute arbitrary code with NT AUTHORITY\SYSTEM privileges upon the next service start or reboot.

GFI USA, LLC Affected
GFI KerioConnect
Before 10.0.9p2
View vendor advisory (opens in new tab)
Published
28 Oct 2026
Exploitation Attempts Reported
28 Oct 2026
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None

CVE References

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation Attempts Observed in the Wild

CVE

Recorded 28 Oct 2026

A trusted third party reported exploitation attempts.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access
Source Added
CVE First 2026-10-28 15:40 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Scanner coverage

No scanner integrations recorded yet.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

No detection artifacts or sensor request patterns are available for this CVE yet.

Check back as sensor telemetry and scanner integrations are updated.

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

8.5 High

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

EPSS

—

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Incorrect Default Permissions CWE-276

All CVSS Scores

CVSS v4.0 8.5 High

CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS v3.1 7.8 High

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

Timeline

From disclosure to observed exploitation attempts

  1. 15:40 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party report of exploitation attempts

  2. 15:32 UTC

    CVE published

    Vulnerability disclosed publicly

  3. 14:41 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-112357

Sample API response 
{
  "cve_id": "CVE-2026-112357",
  "confidence": "High",
  "cvss_score": 8.5,
  "cvss_estimated": false,
  "epss_score": null,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}