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    CVE-2006-2783

    Mozilla Firefox and Thunderbird before 1.5.0.4 strip the Unicode Byte-order-Mark (BOM) from a UTF-8 page before the page is passed to the parser, which allows remote attackers to conduct cross-site scripting (XSS) attacks via a BOM sequence in the middle of a dangerous tag such as SCRIPT.

    Published:Jun 1, 2006
    Last Modified:Apr 16, 2026
    EPS:Jun 2, 2006
    EPSS Score:0.04975
    CVSS Score:4.3

    Affected Products

    Vendor
    Mozilla
    Product
    Firefox
    Vendor
    Mozilla
    Product
    Thunderbird
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-84144 (CVSS 7.5) — Internally found bugs present in Thunderbird 154 and Thunderbird ESR 153.1. Some of these bugs showed evidence…
    CVE-2026-84143 (CVSS 9.8) — Internally found bugs present in Thunderbird 154, Thunderbird ESR 153.1 and Thunderbird ESR 140.14. Some of th…
    CVE-2026-84142 (CVSS 9.8) — Internally found bugs present in Thunderbird 154. Some of these bugs showed evidence of memory corruption or a…
    CVE-2026-84141 (CVSS 9.8) — Integer overflow in the Graphics: ImageLib component. This vulnerability was fixed in Firefox 155, Firefox ESR…
    CVE-2026-84140 (CVSS 9.8) — Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ES…
    CVE-2026-84139 (CVSS 6.1) — Clickjacking issue in the DOM: Events component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.…
    CVE-2026-84138 (CVSS 6.5) — Denial-of-service in the PDF Viewer component. This vulnerability was fixed in Firefox 155 and Thunderbird 155…
    CVE-2026-84137 (CVSS 4.3) — Spoofing issue in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 155, Firefox ESR 153…
    CVE-2026-84136 (CVSS 6.1) — Other issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, …
    CVE-2026-84135 (CVSS 9.8) — Other issue in Firefox Focus for Android. This vulnerability was fixed in Firefox 155.…

    References

    http://lists.apple.com/archives/security-announce/2008//Jul/msg00001.html
    http://lists.apple.com/archives/security-announce/2009/jun/msg00002.html
    http://rhn.redhat.com/errata/RHSA-2006-0609.html
    http://secunia.com/advisories/20376
    http://secunia.com/advisories/20382
    http://secunia.com/advisories/20561
    http://secunia.com/advisories/20709
    http://secunia.com/advisories/21134
    http://secunia.com/advisories/21176
    http://secunia.com/advisories/21178
    http://secunia.com/advisories/21183
    http://secunia.com/advisories/21188
    http://secunia.com/advisories/21210
    http://secunia.com/advisories/21269
    http://secunia.com/advisories/21270
    http://secunia.com/advisories/21324
    http://secunia.com/advisories/21336
    http://secunia.com/advisories/21532
    http://secunia.com/advisories/21607
    http://secunia.com/advisories/21631
    http://secunia.com/advisories/22065
    http://secunia.com/advisories/22066
    http://secunia.com/advisories/31074
    http://secunia.com/advisories/35379
    http://securitytracker.com/id?1016202
    http://securitytracker.com/id?1016214
    http://support.apple.com/kb/HT3613
    http://www.debian.org/security/2006/dsa-1118
    http://www.debian.org/security/2006/dsa-1120
    http://www.debian.org/security/2006/dsa-1134
    http://www.gentoo.org/security/en/glsa/glsa-200606-12.xml
    http://www.gentoo.org/security/en/glsa/glsa-200606-21.xml
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:143
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:145
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:146
    http://www.mozilla.org/security/announce/2006/mfsa2006-42.html
    http://www.novell.com/linux/security/advisories/2006_35_mozilla.html
    http://www.redhat.com/support/errata/RHSA-2006-0578.html
    http://www.redhat.com/support/errata/RHSA-2006-0594.html
    http://www.redhat.com/support/errata/RHSA-2006-0610.html
    http://www.redhat.com/support/errata/RHSA-2006-0611.html
    http://www.securityfocus.com/archive/1/435795/100/0/threaded
    http://www.securityfocus.com/archive/1/446657/100/200/threaded
    http://www.securityfocus.com/archive/1/446658/100/200/threaded
    http://www.securityfocus.com/bid/18228
    http://www.vupen.com/english/advisories/2006/2106
    http://www.vupen.com/english/advisories/2006/3748
    http://www.vupen.com/english/advisories/2006/3749
    http://www.vupen.com/english/advisories/2008/0083
    http://www.vupen.com/english/advisories/2008/2094/references
    http://www.vupen.com/english/advisories/2009/1522
    https://exchange.xforce.ibmcloud.com/vulnerabilities/26852
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10772
    https://usn.ubuntu.com/296-1/
    https://usn.ubuntu.com/296-2/
    https://usn.ubuntu.com/297-1/
    https://usn.ubuntu.com/297-3/
    https://usn.ubuntu.com/323-1/
    http://lists.apple.com/archives/security-announce/2008//Jul/msg00001.html
    http://lists.apple.com/archives/security-announce/2009/jun/msg00002.html
    http://rhn.redhat.com/errata/RHSA-2006-0609.html
    http://secunia.com/advisories/20376
    http://secunia.com/advisories/20382
    http://secunia.com/advisories/20561
    http://secunia.com/advisories/20709
    http://secunia.com/advisories/21134
    http://secunia.com/advisories/21176
    http://secunia.com/advisories/21178
    http://secunia.com/advisories/21183
    http://secunia.com/advisories/21188
    http://secunia.com/advisories/21210
    http://secunia.com/advisories/21269
    http://secunia.com/advisories/21270
    http://secunia.com/advisories/21324
    http://secunia.com/advisories/21336
    http://secunia.com/advisories/21532
    http://secunia.com/advisories/21607
    http://secunia.com/advisories/21631
    http://secunia.com/advisories/22065
    http://secunia.com/advisories/22066
    http://secunia.com/advisories/31074
    http://secunia.com/advisories/35379
    http://securitytracker.com/id?1016202
    http://securitytracker.com/id?1016214
    http://support.apple.com/kb/HT3613
    http://www.debian.org/security/2006/dsa-1118
    http://www.debian.org/security/2006/dsa-1120
    http://www.debian.org/security/2006/dsa-1134
    http://www.gentoo.org/security/en/glsa/glsa-200606-12.xml
    http://www.gentoo.org/security/en/glsa/glsa-200606-21.xml
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:143
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:145
    http://www.mandriva.com/security/advisories?name=MDKSA-2006:146
    http://www.mozilla.org/security/announce/2006/mfsa2006-42.html
    http://www.novell.com/linux/security/advisories/2006_35_mozilla.html
    http://www.redhat.com/support/errata/RHSA-2006-0578.html
    http://www.redhat.com/support/errata/RHSA-2006-0594.html
    http://www.redhat.com/support/errata/RHSA-2006-0610.html
    http://www.redhat.com/support/errata/RHSA-2006-0611.html
    http://www.securityfocus.com/archive/1/435795/100/0/threaded
    http://www.securityfocus.com/archive/1/446657/100/200/threaded
    http://www.securityfocus.com/archive/1/446658/100/200/threaded
    http://www.securityfocus.com/bid/18228
    http://www.vupen.com/english/advisories/2006/2106
    http://www.vupen.com/english/advisories/2006/3748
    http://www.vupen.com/english/advisories/2006/3749
    http://www.vupen.com/english/advisories/2008/0083
    http://www.vupen.com/english/advisories/2008/2094/references
    http://www.vupen.com/english/advisories/2009/1522
    https://exchange.xforce.ibmcloud.com/vulnerabilities/26852
    https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10772
    https://usn.ubuntu.com/296-1/
    https://usn.ubuntu.com/296-2/
    https://usn.ubuntu.com/297-1/
    https://usn.ubuntu.com/297-3/
    https://usn.ubuntu.com/323-1/

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High