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Vulnerability record · CVE-2008-5556 · published 12 December 2008

CVE-2008-5556: Microsoft internet explorer cross-site scripting vulnerability

Microsoft · Internet Explorer

The XSS Filter in Microsoft Internet Explorer 8.0 Beta 2 does not recognize attack patterns designed to operate against web pages that are encoded with utf-7, which allows remote attackers to bypass the XSS protection mechanism and conduct XSS attacks by injecting crafted utf-7 content. NOTE: the vendor reportedly disputes this issue, stating "Behaviour is by design.

4.3 CVSS 2.0 Medium EPSS 11% · top 4.2% CWE-79 · Cross-site scripting
4.3CVSS 2.0 base score
11%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
16 Jun 2026Last modified by NVD

Description

The XSS Filter in Microsoft Internet Explorer 8.0 Beta 2 does not recognize attack patterns designed to operate against web pages that are encoded with utf-7, which allows remote attackers to bypass the XSS protection mechanism and conduct XSS attacks by injecting crafted utf-7 content. NOTE: the vendor reportedly disputes this issue, stating "Behaviour is by design.

AV:N/AC:M/Au:N/C:N/I:P/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/archive/1/499124/100/0/threaded
https://exchange.xforce.ibmcloud.com/vulnerabilities/47277
http://www.securityfocus.com/archive/1/499124/100/0/threaded
https://exchange.xforce.ibmcloud.com/vulnerabilities/47277

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2008-5556), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.