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CVE-2019-9803

High

Description

The Upgrade-Insecure-Requests (UIR) specification states that if UIR is enabled through Content Security Policy (CSP), navigation to a same-origin URL must be upgraded to HTTPS. Firefox will incorrectly navigate to an HTTP URL rather than perform the security upgrade requested by the CSP in some circumstances, allowing for potential man-in-the-middle attacks on the linked resources. This vulnerability affects Firefox < 66.

SeverityHigh
CVSS7.4
Exploit probability—
ProductMozilla Firefox
PublishedApr 26, 2019
First seenApr 26, 2019

How to fix

Update
  • mozilla firefox66.0 or later

Affected products

ProductAffected versionsFixed in
mozilla firefoxv < 66.066.0

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