What’s Vulnerable › Vulnerabilities

CVE-2018-18499

• Severity: medium (CVSS 6.5 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-02-28 · updated 2026-06-17
• Weakness: CWE-346

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.

Affected products

• Mozilla Firefox: before 62.0 — fixed in 62.0
• Mozilla Firefox ESR: before 60.2 — fixed in 60.2
• Mozilla Thunderbird: before 60.2.1 — fixed in 60.2.1

How to fix

Upgrade to a fixed version: Mozilla Firefox 62.0; Mozilla Firefox ESR 60.2; Mozilla Thunderbird 60.2.1. Check the vendor advisory for mitigations.

References

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

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