CVE-2019-9803

Reference Links

• https://bugzilla.mozilla.org/show_bug.cgi?id=1437009
• https://bugzilla.mozilla.org/show_bug.cgi?id=1515863
• https://w3c.github.io/webappsec-upgrade-insecure-requests/
• https://www.mozilla.org/security/advisories/mfsa2019-07/
• https://launchpad.net/bugs/cve/CVE-2019-9803
• https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/
• https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/#CVE-2019-9788
• https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/#CVE-2019-9803
• https://security-tracker.debian.org/tracker/CVE-2019-9803
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9803
• https://nvd.nist.gov/vuln/detail/CVE-2019-9803
• https://ubuntu.com/security/CVE-2019-9803

Parent vulnerabilities

(Appears in the following advisories)

• MFSA2019-07

Peer vulnerabilities

(Found alongside the following vulnerabilities)

• CVE-2019-9790
• CVE-2019-9791
• CVE-2019-9792
• CVE-2019-9793
• CVE-2019-9794
• CVE-2019-9795
• CVE-2019-9796
• CVE-2019-9797
• CVE-2019-9798
• CVE-2019-9799
• CVE-2019-9801
• CVE-2019-9802
• CVE-2019-9803
• CVE-2019-9804
• CVE-2019-9805
• CVE-2019-9806
• CVE-2019-9807
• CVE-2019-9809
• CVE-2019-9808
• CVE-2019-9789
• CVE-2019-9788

Frequently Asked Questions

• What is CVE-2019-9803?

  CVE-2019-9803 is a vulnerability in the Upgrade-Insecure-Requests (UIR) specification that affects Mozilla Firefox.

• What is the severity level of CVE-2019-9803?

  The severity level of CVE-2019-9803 is high, with a CVSS score of 7.4.

• How does CVE-2019-9803 affect Firefox?

  CVE-2019-9803 affects Firefox by causing navigation to an HTTP URL instead of performing the requested security upgrade when the Upgrade-Insecure-Requests (UIR) is enabled through Content Security Policy (CSP).

• How can I fix CVE-2019-9803 in Firefox?

  To fix CVE-2019-9803 in Firefox, update to version 66.0 or later.

• Where can I find more information about CVE-2019-9803?

  You can find more information about CVE-2019-9803 on the Mozilla Bugzilla website and the W3C Upgrade-Insecure-Requests specification.