CVE-2026-112353

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.

CVSS 4.0

6.2CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N

CVSS 3.1

8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N

CWEs

CWE-79, CWE-83

Published

2026-10-27

Modified

2026-10-27

Record from

the CVE List, synced 2026-10-27

Affected

• gfi usa, llc:gfi kerioconnect

References

• https://gfi.ai/resource/kerioconnect-product-releases/
• https://www.vulncheck.com/advisories/gfi-kerioconnect-8p2-stored-xss-via-svg-attachment

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