GFI KerioConnect < 10.0.9p2 XSS via Link Auto-Formatter

published 2026-10-28 12 d ago modified 2026-10-29 10 d ago also EUVD-2026-112138

cvss: 6.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 16%
public exploits: 0; none known

GFI KerioConnect (Kerio Connect) before 10.0.9 Patch 2 contains a cross-site scripting vulnerability in the Webmail component that allows a remote attacker to spoof link targets or inject HTML into a message as rendered in a victim's authenticated Webmail session by sending a crafted email whose text is already inside a link. Attackers can exploit the link auto-formatter's re-processing of already-linked text, using quote characters to break out of the href attribute and inject attacker-controlled markup to execute script in the victim's session.

Patch / fix

fixed in 1 links 1

GFI USA, LLC GFI KerioConnect 10.0.9p2

gfi.ai/resource/kerioconnect-product-releases/ patch

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 11 d ago (2026-10-28)

Exploit prediction

0.25% chance of exploitation in the next 30 days, higher than 16% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	5.1	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
CNA	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CNA	4.0	5.1	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected products

GFI USA, LLC GFI KerioConnect

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation
CWE-83 Improper Neutralization of Script in Attributes in a Web Page

References

gfi.ai /resource/kerioconnect-product-releases/
release-notes, patch
vulncheck.com /advisories/gfi-kerioconnect-9p2-xss-via-link-auto-formatter
third-party-advisory

Sources

CVE List CVE-2026-112356
NVD CVE-2026-112356

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary