Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://gfi.ai/resource/kerioconnect-product-releases/
- https://www.vulncheck.com/advisories/gfi-kerioconnect-8p2-stored-xss-via-svg-att
FAQ
What is CVE-2026-112353?
CVE-2026-112353 is a vulnerability with a CVSS score of 8.2 (HIGH). 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 authe...
How severe is CVE-2026-112353?
CVE-2026-112353 has been rated HIGH with a CVSS base score of 8.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-112353?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.