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Vulnerability record · CVE-2008-5553 · published 12 December 2008

CVE-2008-5553: Microsoft internet explorer cross-site scripting vulnerability

Microsoft · Internet Explorer

The XSS Filter in Microsoft Internet Explorer 8.0 Beta 2 disables itself upon encountering a certain X-XSS-Protection HTTP header, which allows remote attackers to bypass the XSS protection mechanism and conduct XSS attacks by injecting this header after a CRLF sequence. NOTE: the vendor has reportedly stated that the XSS Filter intentionally does not attempt to "address every conceivable XSS attack scenario."

4.3 CVSS 2.0 Medium EPSS 12% · top 4.1% CWE-79 · Cross-site scripting
4.3CVSS 2.0 base score
12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

The XSS Filter in Microsoft Internet Explorer 8.0 Beta 2 disables itself upon encountering a certain X-XSS-Protection HTTP header, which allows remote attackers to bypass the XSS protection mechanism and conduct XSS attacks by injecting this header after a CRLF sequence. NOTE: the vendor has reportedly stated that the XSS Filter intentionally does not attempt to "address every conceivable XSS attack scenario."

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
https://exchange.xforce.ibmcloud.com/vulnerabilities/47442
http://www.securityfocus.com/archive/1/499124/100/0/threaded
https://exchange.xforce.ibmcloud.com/vulnerabilities/47277
https://exchange.xforce.ibmcloud.com/vulnerabilities/47442

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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-2008-5553), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.