Is CVE-2026-112353 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-112353 being exploited in the wild.

How severe is CVE-2026-112353?

High severity, with a CVSS score of 8.2, published 27 October 2026.

Which products and versions are affected?

GFI KerioConnect before 10.0.8 Patch 2.

Is there a fix for CVE-2026-112353?

Yes: fixed in 10.0.8 Patch 2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-112353 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-112353?

Check whether you run GFI KerioConnect at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-112353: GFI KerioConnect stored XSS in Webmail via SVG attachment

CVE-2026-112353 · Severity: high · CVSS 8.2 · Published 2026-10-27

GFI KerioConnect is an email and collaboration server used by organizations for messaging and calendar services. The Webmail component contains a stored cross-site scripting flaw that allows remote attackers to run malicious JavaScript by uploading a crafted SVG email attachment, potentially stealing user credentials and complete mailbox contents when the victim opens the attachment.

Vendors: GFI.

Quick answers

Is CVE-2026-112353 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-112353 being exploited in the wild.
How severe is CVE-2026-112353?: High severity, with a CVSS score of 8.2, published 27 October 2026.
Which products and versions are affected?: GFI KerioConnect before 10.0.8 Patch 2.
Is there a fix for CVE-2026-112353?: Yes: fixed in 10.0.8 Patch 2. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-112353 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-112353?: Check whether you run GFI KerioConnect at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 10.0.8 Patch 2

Technical details

A stored XSS vulnerability in the Webmail component allows remote attackers to bypass SVG event-handler attribute sanitization and execute JavaScript in an authenticated user's session. The temporary-download endpoint lacks sufficient Content-Security-Policy sandbox protection, enabling script execution when crafted email attachments are opened. This grants attackers access to session credentials and mailbox data.

Affected products

GFI KerioConnect before 10.0.8 Patch 2

Timeline

2026-10-27: disclosed
2026-10-27: exploited: Proofpoint Threat Research observed exploitation in the wild as credential and mailbox stealer
2025-11-28: patched: Fix released in 10.0.8p2

References

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