Microsoft Internet Explorer 8/9 HTML Sanitization toStaticHTML String information disclosure

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CTI Interest Score
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A vulnerability was found in Microsoft Internet Explorer 8/9 (Web Browser). It has been classified as problematic. Affected is the function toStaticHTML of the component HTML Sanitization. The manipulation as part of a String leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. CVE summarizes:

The toStaticHTML API (aka the SafeHTML component) in Microsoft Internet Explorer 8 and 9, Communicator 2007 R2, and Lync 2010 and 2010 Attendee does not properly handle event attributes and script, which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via a crafted HTML document, aka "HTML Sanitization Vulnerability."

The issue has been introduced in 03/05/2008. The weakness was disclosed 06/12/2012 by Adi Cohen with IBM Rational Application Security as MS12-037 as confirmed bulletin (Technet). The advisory is shared for download at The public release has been coordinated in cooperation with the vendor. This vulnerability is traded as CVE-2012-1858 since 03/22/2012. It is possible to launch the attack remotely. A authentication is required for exploitation. Successful exploitation requires user interaction by the victim. Technical details and a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1592.

A public exploit has been developed by Adi Cohen and been published 2 months after the advisory. The exploit is shared for download at It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 1560 days. During that time the estimated underground price was around $5k-$25k. The vulnerability scanner Nessus provides a plugin with the ID 59913 (MS12-050: Vulnerabilities in SharePoint Could Allow Elevation of Privilege (2695502)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins. The commercial vulnerability scanner Qualys is able to test this issue with plugin 110185 (Microsoft SharePoint Privilege Escalation Vulnerability (MS12-050)).

Applying the patch MS12-037 is able to eliminate this problem. The bugfix is ready for download at A possible mitigation has been published immediately after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 12436.

The vulnerability is also documented in the databases at X-Force (75963), Tenable (59913) and Exploit-DB (19777).


  • Microsoft Internet Explorer 8/9
  • Microsoft Lync 2010








  • end of life

CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.2

VulDB Base Score: 3.5
VulDB Temp Score: 3.2
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Class: Information disclosure
CWE: CWE-200 / CWE-284 / CWE-266

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Adi Cohen
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Nessus ID: 59913
Nessus Name: MS12-050: Vulnerabilities in SharePoint Could Allow Elevation of Privilege (2695502)
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OpenVAS ID: 902682
OpenVAS Name: Microsoft Internet Explorer Multiple Vulnerabilities (2699988)
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Recommended: Patch
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Patch: MS12-037
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03/05/2008 🔍
03/22/2012 +1478 days 🔍
06/12/2012 +81 days 🔍
06/12/2012 +0 days 🔍
06/12/2012 +0 days 🔍
06/12/2012 +0 days 🔍
06/12/2012 +0 days 🔍
06/12/2012 +0 days 🔍
06/12/2012 +0 days 🔍
06/13/2012 +1 days 🔍
06/14/2012 +1 days 🔍
07/11/2012 +27 days 🔍
07/12/2012 +1 days 🔍
07/12/2012 +0 days 🔍
03/25/2021 +3178 days 🔍



Advisory: MS12-037
Researcher: Adi Cohen
Organization: IBM Rational Application Security
Status: Confirmed
Coordinated: 🔍

CVE: CVE-2012-1858 (🔍)

X-Force: 75963 - Microsoft Windows Knowledge Base Article 2699988 update is not installed, High Risk
SecurityTracker: 1027147 - Microsoft Internet Explorer Bugs Let Remote Users Execute Arbitrary Code, Conduct Cross-Site Scripting Attacks, and Obtain Potentially Sensitive Information
Vulnerability Center: 35307 - [MS12-037, MS12-039, MS12-050] Microsoft Internet Explorer 8 and 9 SafeHTML XSS Vulnerability via a Crafted HTML, Medium
SecurityFocus: 53842
Secunia: 48429 - Microsoft Lync / Office Communicator Multiple Vulnerabilities, Highly Critical
OSVDB: 82861 - Microsoft IE HTML Sanitization String Handling Remote Information Disclosure

scip Labs:


Created: 06/14/2012 11:06 AM
Updated: 03/25/2021 02:20 PM
Changes: 06/14/2012 11:06 AM (67), 04/07/2017 12:02 PM (40), 03/25/2021 02:08 PM (7), 03/25/2021 02:13 PM (2), 03/25/2021 02:20 PM (1)
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Cache ID: 44:4F1:40


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