---
id: "CVE-2013-3918"
kind: "vulnerability"
aliases: ["CVE-2013-3918"]
title: "The InformationCardSigninHelper Class ActiveX control in icardie.dll in Microsoft Windows XP SP2 and SP3, Windows\u2026"
severity: "critical"
cvss: 9.3
epss: null
exploited: true
status: "open"
category: "other"
products: [{"name": "Microsoft Windows", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows 7", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows 8", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows 8.1", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows rt", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows rt 8.1", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows server 2003", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows server 2008", "fixed": [], "affected": "= r2", "ecosystem": "vendor"}, {"name": "microsoft windows server 2008", "fixed": [], "affected": "= sp2", "ecosystem": "vendor"}, {"name": "microsoft windows server 2012", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows server 2012", "fixed": [], "affected": "= r2", "ecosystem": "vendor"}, {"name": "microsoft windows vista", "fixed": [], "affected": "", "ecosystem": "vendor"}, {"name": "microsoft windows xp", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["end-users", "exploited", "internet-explorer", "other", "windows"]
not_affected_if: ["no-ie-activex", "not-windows"]
published_at: "2013-11-12T14:35:11+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-23T23:44:51+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2013-3918", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2013-3918", "first_seen_at": "2026-10-23T23:44:51+00:00"}]
---

# The InformationCardSigninHelper Class ActiveX control in icardie.dll in Microsoft Windows XP SP2 and SP3, Windows…

A out-of-bounds write in the InformationCardSigninHelper ActiveX control (icardie.dll) in Microsoft Windows lets a malicious webpage run code. An attacker gets the same user rights as the person viewing the page, and CISA lists it as exploited in the wild.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Microsoft Windows affected ? fixed ?
- vendor:microsoft windows 7 affected ? fixed ?
- vendor:microsoft windows 8 affected ? fixed ?
- vendor:microsoft windows 8.1 affected ? fixed ?
- vendor:microsoft windows rt affected ? fixed ?
- vendor:microsoft windows rt 8.1 affected ? fixed ?
- vendor:microsoft windows server 2003 affected ? fixed ?
- vendor:microsoft windows server 2008 affected = r2 fixed ?
- vendor:microsoft windows server 2008 affected = sp2 fixed ?
- vendor:microsoft windows server 2012 affected ? fixed ?
- vendor:microsoft windows server 2012 affected = r2 fixed ?
- vendor:microsoft windows vista affected ? fixed ?
- vendor:microsoft windows xp affected ? fixed ?

## How to check

Check whether icardie.dll exists on Windows machines, for example with: dir %windir%\system32\icardie.dll
Check whether the InformationCard ActiveX control is registered for Internet Explorer.

## Fix

Apply the vendor mitigation per Microsoft's advisory, or stop using the affected product.

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2013-3918
- 2026-10-23T23:44:51+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2013-3918

## From the sources

Microsoft Windows contains an out-of-bounds write vulnerability in the InformationCardSigninHelper Class ActiveX control, icardie.dll. An attacker could exploit the vulnerability by constructing a specially crafted webpage. When a user views the webpage, the vulnerability could allow remote code execution. An attacker who successfully exploited this vulnerability could gain the same user rights as the current user. The impacted product could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.

CISA required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_