CVE-2025-2975Network attack vector

Stored cross-site scripting via signature HTML source

Published Mar 31, 2025 · Updated Mar 31, 2025

Stored cross-site scripting in GFI Software Kerio Connect 10.0.6 allows remote authenticated users to alter rendered signature content. The affected Settings/Email/Signature/EditHtmlSource path processes crafted signature HTML, but the CNA does not identify the responsible function or disclose the exact sanitization failure. An authenticated account must save the crafted signature and another user must render it, limiting the demonstrated consequence to script-driven content changes in that user's browser.

CVSS severity5.1
Medium
EPSS probability0.29%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in GFI Software Kerio Connect 10.0.6 allows remote authenticated users to alter rendered signature content. The affected Settings/Email/Signature/EditHtmlSource path processes crafted signature HTML, but the CNA does not identify the responsible function or disclose the exact sanitization failure. An authenticated account must save the crafted signature and another user must render it, limiting the demonstrated consequence to script-driven content changes in that user's browser.

The record

CVE
CVE-2025-2975
Published
Mar 31, 2025
Updated
Mar 31, 2025
Vendor
GFI Software
Product
Kerio Connect
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 31, 2025CVE publishedPublication date reported by the CVE source.
  2. Mar 31, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

GFI Software · Kerio Connectversion=10.0.6

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
5.1VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
3.5VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
3.5VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
4.0VulDB CNAAV:N/AC:L/Au:S/C:N/I:P/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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