Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | thunderbird | 1.5.0.4-1 | — |
| Debian 13 | thunderbird | 1.5.0.4-1 | — |
| Debian 12 | thunderbird | 1.5.0.4-1 | — |
| Debian 3.1 | mozilla | 2:1.7.8-1sarge7.1 | DSA-1118 |
| Debian 3.1 | mozilla-firefox | 1.0.4-2sarge9 | DSA-1120 |
| Debian 3.1 | mozilla-thunderbird | 1.0.2-2.sarge1.0.8a | DSA-1134-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 4 | devhelp +1 | 0.10-0.2.el4 | RHSA-2006:0609 |
| RHEL 4 | firefox +1 | 1.5.0.5-0.el4.1 | RHSA-2006:0611, RHSA-2006:0610 |
| RHEL 4 | seamonkey +5 | 1.0.3-0.el4.1 | RHSA-2006:0609 |
| RHEL 3 | seamonkey +9 | 1.0.2-0.1.0.EL3 | RHSA-2006:0578 |
Advisories 7
- RHSA-2006:0611 Red Hat Security Advisory: thunderbird security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2006:0609 Red Hat Security Advisory: seamonkey security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2006:0610 Red Hat Security Advisory: firefox security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2006:0578 Red Hat Security Advisory: seamonkey security update (was mozilla) Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DSA-1120 mozilla-firefox - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1118 mozilla - several Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-1134-1 mozilla-thunderbird - several vulnerabilities Debian Security (DSA / DLA) · Mar 9, 2026
References
- 20709 third-party-advisory
- 21176 third-party-advisory
- MDKSA-2006:145 vendor-advisory
- ADV-2006-3748 vdb-entry
- USN-297-3 vendor-advisory
- USN-296-1 vendor-advisory
- USN-323-1 vendor-advisory
- 20561 third-party-advisory
- APPLE-SA-2009-06-08-1 vendor-advisory
- 21210 third-party-advisory
- RHSA-2006:0594 vendor-advisory
- 21336 third-party-advisory
- 20382 third-party-advisory
- 1016214 vdb-entry
- 20060602 rPSA-2006-0091-1 firefox thunderbird mailing-list
- ADV-2006-3749 vdb-entry
- ADV-2009-1522 vdb-entry
- RHSA-2006:0610 vendor-advisory
- 20376 third-party-advisory
- MDKSA-2006:146 vendor-advisory
- RHSA-2006:0609 vendor-advisory
- 21178 third-party-advisory
- 1016202 vdb-entry
- 21607 third-party-advisory
- 18228 vdb-entry
- 21532 third-party-advisory
- 21270 third-party-advisory
- ADV-2008-0083 vdb-entry
- 21188 third-party-advisory
- 21134 third-party-advisory
- 21631 third-party-advisory
- SSRT061181 vendor-advisory
- SSRT061236 vendor-advisory
- 35379 third-party-advisory
- USN-296-2 vendor-advisory
- GLSA-200606-21 vendor-advisory
- DSA-1118 vendor-advisory
- DSA-1120 vendor-advisory
- RHSA-2006:0611 vendor-advisory
- mozilla-bom-utf8-xss(26852) vdb-entry
- APPLE-SA-2008-07-11 vendor-advisory
- DSA-1134 vendor-advisory
- GLSA-200606-12 vendor-advisory
- oval:org.mitre.oval:def:10772 vdb-entry signature
- 21324 third-party-advisory
- 21183 third-party-advisory
- ADV-2008-2094 vdb-entry
- 22066 third-party-advisory
- 21269 third-party-advisory
- SUSE-SA:2006:035 vendor-advisory
- http://support.apple.com/kb/HT3613
- USN-297-1 vendor-advisory
- RHSA-2006:0578 vendor-advisory
- ADV-2006-2106 vdb-entry
- MDKSA-2006:143 vendor-advisory
- http://www.mozilla.org/security/announce/2006/mfsa2006-42.html
- 22065 third-party-advisory
- 31074 third-party-advisory