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Vulnerability record · CVE-2007-3670 · published 10 July 2007

CVE-2007-3670: Microsoft internet explorer cross-site scripting vulnerability

Microsoft · Internet Explorer

Argument injection vulnerability in Microsoft Internet Explorer, when running on systems with Firefox installed and certain URIs registered, allows remote attackers to conduct cross-browser scripting attacks and execute arbitrary commands via shell metacharacters in a (1) FirefoxURL or (2) FirefoxHTML URI, which are inserted into the command line that is created when invoking firefox.exe. NOTE: it has been debated as to whether the issue is in Internet Explorer or Firefox. As of 20070711, it is CVE's opinion that IE appears to be failing to properly delimit the URL argument when invoking Firefox, and this issue could arise with other protocol handlers in IE as well. However, Mozilla has stated that it will address the issue with a "defense in depth" fix that will "prevent IE from sending Firefox malicious data."

4.3 CVSS 2.0 Medium EPSS 29% · top 1.9% CWE-79 · Cross-site scripting
4.3CVSS 2.0 base score
29%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
78References
16 Jun 2026Last modified by NVD

Description

Argument injection vulnerability in Microsoft Internet Explorer, when running on systems with Firefox installed and certain URIs registered, allows remote attackers to conduct cross-browser scripting attacks and execute arbitrary commands via shell metacharacters in a (1) FirefoxURL or (2) FirefoxHTML URI, which are inserted into the command line that is created when invoking firefox.exe. NOTE: it has been debated as to whether the issue is in Internet Explorer or Firefox. As of 20070711, it is CVE's opinion that IE appears to be failing to properly delimit the URL argument when invoking Firefox, and this issue could arise with other protocol handlers in IE as well. However, Mozilla has stated that it will address the issue with a "defense in depth" fix that will "prevent IE from sending Firefox malicious data."

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

Affected products

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

References

LinkTags
ftp://ftp.slackware.com/pub/slackware/slackware-12.0/ChangeLog.txt
http://archives.neohapsis.com/archives/fulldisclosure/2007-07/0160.html
http://blog.mozilla.com/security/2007/07/10/security-issue-in-url-protocol-handling-on-windows/
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c00771742
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c00774579
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=565
http://larholm.com/2007/07/10/internet-explorer-0day-exploit/
http://msinfluentials.com/blogs/jesper/archive/2007/07/10/blocking-the-firefox-gt-ie-0-day.aspx
http://osvdb.org/38017
http://secunia.com/advisories/25984 Vendor Advisory
http://secunia.com/advisories/26096 Vendor Advisory
http://secunia.com/advisories/26149 Vendor Advisory
http://secunia.com/advisories/26204 Vendor Advisory
http://secunia.com/advisories/26216 Vendor Advisory
http://secunia.com/advisories/26258 Vendor Advisory
http://secunia.com/advisories/26271 Vendor Advisory
http://secunia.com/advisories/26572 Vendor Advisory
http://secunia.com/advisories/28179
http://secunia.com/advisories/28363
http://support.novell.com/techcenter/psdb/07d098f99c9fe6956523beae37f32fda.html
http://www.kb.cert.org/vuls/id/358017 US Government Resource
http://www.mandriva.com/security/advisories?name=MDKSA-2007:152
http://www.mozilla.org/security/announce/2007/mfsa2007-23.html
http://www.mozilla.org/security/announce/2007/mfsa2007-40.html
http://www.novell.com/linux/security/advisories/2007_49_mozilla.html
http://www.securityfocus.com/archive/1/473276/100/0/threaded
http://www.securityfocus.com/bid/24837
http://www.securitytracker.com/id?1018351
http://www.securitytracker.com/id?1018360
http://www.theregister.co.uk/2007/07/11/ie_firefox_vuln/
http://www.ubuntu.com/usn/usn-503-1
http://www.us-cert.gov/cas/techalerts/TA07-199A.html US Government Resource
http://www.virusbtn.com/news/virus_news/2007/07_11.xml
http://www.vupen.com/english/advisories/2007/2473
http://www.vupen.com/english/advisories/2007/2565
http://www.vupen.com/english/advisories/2007/4272
http://www.vupen.com/english/advisories/2008/0082
http://www.xs-sniper.com/sniperscope/IE-Pwns-Firefox.html
https://exchange.xforce.ibmcloud.com/vulnerabilities/35346
ftp://ftp.slackware.com/pub/slackware/slackware-12.0/ChangeLog.txt

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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-2007-3670), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.