CVE-2019-9803

    Dashboard / Vulnerabilities / CVE-2019-9803

    CVE-2019-9803

    Published: 26 Apr 2019Last Modified: 10 Mar 2026

    Summary:

    Details: 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.

    References: , https://w3c.github.io/webappsec-upgrade-insecure-requests/, https://www.mozilla.org/security/advisories/mfsa2019-07/, https://bugzilla.mozilla.org/show_bug.cgi?id=1437009, https://bugzilla.mozilla.org/show_bug.cgi?id=1515863

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High