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Vulnerability record · CVE-2019-11743 · published 27 September 2019

CVE-2019-11743: Mozilla firefox observable discrepancy vulnerability

Mozilla · Firefox

Navigation events were not fully adhering to the W3C's "Navigation-Timing Level 2" draft specification in some instances for the unload event, which restricts access to detailed timing attributes to only be same-origin. This resulted in potential cross-origin information exposure of history through timing side-channel attacks. This vulnerability affects Firefox < 69, Thunderbird < 68.1, Thunderbird < 60.9, Firefox ESR < 60.9, and Firefox ESR < 68.1.

3.7 CVSS 3.1 Low EPSS 1.8% · top 22.4% CWE-203 · Observable discrepancy
3.7CVSS 3.1 base score, v2 4.3
1.8%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
26References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Navigation events were not fully adhering to the W3C's "Navigation-Timing Level 2" draft specification in some instances for the unload event, which restricts access to detailed timing attributes to only be same-origin. This resulted in potential cross-origin information exposure of history through timing side-channel attacks. This vulnerability affects Firefox < 69, Thunderbird < 68.1, Thunderbird < 60.9, Firefox ESR < 60.9, and Firefox ESR < 68.1.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1560495 Issue TrackingPermissions RequiredVendor Advisory
https://security.gentoo.org/glsa/201911-07
https://usn.ubuntu.com/4150-1/
https://w3c.github.io/navigation-timing ExploitThird Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-25/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-26/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-27/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-29/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-30/ Vendor Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00009.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
https://bugzilla.mozilla.org/show_bug.cgi?id=1560495 Issue TrackingPermissions RequiredVendor Advisory
https://security.gentoo.org/glsa/201911-07
https://usn.ubuntu.com/4150-1/
https://w3c.github.io/navigation-timing ExploitThird Party Advisory
https://www.mozilla.org/security/advisories/mfsa2019-25/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-26/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-27/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-29/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2019-30/ Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2019-11743), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.