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VulnerabilityPublished

CVE-2026-102143: Kiteworks Email Protection Gateway · Missing Authentication

Affects Kiteworks Email Protection GatewaySource CVE Database V5

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Not known to be exploited · CVSS 7.5 High : upgrade to 9.5.1 soon.

Data as of 14 Nov 2026, 20:43 UTC

CVSS 3.1 base score
7.5High
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.3% chance of exploitation in 30 days – higher than 25% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 9.5.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 14 Nov 2026.

What to do

Upgrade Kiteworks Email Protection Gateway to 9.5.1.

Affected software

ProductAffectedFixed in
KiteworksEmail Protection GatewayAffected
  • <9.5.1
Fixed in
  • 9.5.1

AI-suggested

If you cannot patch yet, restrict access to the administrative upload handler and monitor for suspicious activity related to file uploads.

Description

CVE-2026-102143 is a vulnerability in Kiteworks Email Protection Gateway where an unauthenticated attacker can write a file with attacker-controlled content to the appliance filesystem via an administrative upload handler lacking proper authentication. This flaw does not directly allow code execution, as that would require an additional vulnerability to place the file in an executable location. The issue affects versions prior to 9.5.1.

References

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