GFI KerioConnect (Kerio Connect) before 10.0.8 Patch 2 contains a stored cross-site scripting vulnerability in the Webmail component that allows a remote attacker to run JavaScript in a victim's authenticated Webmail session by uploading a crafted SVG email attachment that bypasses sanitization of event-handler attributes. Attackers can exploit the temporary-download endpoint's insufficient Content-Security-Policy sandbox to execute scripts when the attachment is opened, enabling theft of the victim's credentials and mailbox contents. Proofpoint Threat Research has observed exploitation in the wild as a credential and mailbox stealer.

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Solution

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Workaround

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History

Fri, 30 Oct 2026 23:45:00 +0000

Type Values Removed Values Added
First Time appeared Gfi
Gfi kerio Connect
Vendors & Products Gfi
Gfi kerio Connect

Wed, 28 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 27 Oct 2026 16:30:00 +0000

Type Values Removed Values Added
Description GFI KerioConnect (Kerio Connect) before 10.0.8 Patch 2 contains a stored cross-site scripting vulnerability in the Webmail component that allows a remote attacker to run JavaScript in a victim's authenticated Webmail session by uploading a crafted SVG email attachment that bypasses sanitization of event-handler attributes. Attackers can exploit the temporary-download endpoint's insufficient Content-Security-Policy sandbox to execute scripts when the attachment is opened, enabling theft of the victim's credentials and mailbox contents. Proofpoint Threat Research has observed exploitation in the wild as a credential and mailbox stealer.
Title GFI KerioConnect < 10.0.8p2 Stored XSS via SVG Attachment
Weaknesses CWE-79
CWE-83
References
Metrics cvssV3_1

{'score': 8.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N'}

cvssV4_0

{'score': 6.2, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-28T16:16:12.399Z

Reserved: 2026-10-19T14:41:46.702Z

Link: CVE-2026-112353

cve-icon Vulnrichment

Updated: 2026-10-28T14:34:05.318Z

cve-icon NVD

Status : Deferred

Published: 2026-10-27T17:16:58.203

Modified: 2026-10-28T17:17:41.833

Link: CVE-2026-112353

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-30T23:17:10Z

Weaknesses