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Vulnerability record · CVE-2008-5555 · published 12 December 2008

CVE-2008-5555: Microsoft internet explorer cross-site scripting vulnerability

Microsoft · Internet Explorer

Microsoft Internet Explorer 8.0 Beta 2 relies on the XDomainRequestAllowed HTTP header to authorize data exchange between domains, which allows remote attackers to bypass the product's XSS Filter protection mechanism, and conduct XSS and cross-domain attacks, by injecting this header after a CRLF sequence, related to "XDomainRequest Allowed Injection (XAI)." 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 13% · top 3.9% CWE-79 · Cross-site scripting
4.3CVSS 2.0 base score
13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
16 Jun 2026Last modified by NVD

Description

Microsoft Internet Explorer 8.0 Beta 2 relies on the XDomainRequestAllowed HTTP header to authorize data exchange between domains, which allows remote attackers to bypass the product's XSS Filter protection mechanism, and conduct XSS and cross-domain attacks, by injecting this header after a CRLF sequence, related to "XDomainRequest Allowed Injection (XAI)." 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/47444
http://www.securityfocus.com/archive/1/499124/100/0/threaded
https://exchange.xforce.ibmcloud.com/vulnerabilities/47277
https://exchange.xforce.ibmcloud.com/vulnerabilities/47444

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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-2008-5555), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.