Public Date:
1748654: CVE-2019-11743 Mozilla: Cross-origin access to unload event attributes

The MITRE CVE dictionary describes this issue as:

** RESERVED ** This candidate has been reserved by an organization or individual that will use it when announcing a new security problem. When the candidate has been publicized, the details for this candidate will be provided.

Find out more about CVE-2019-11743 from the MITRE CVE dictionary dictionary and NIST NVD.


In general, this flaw cannot be exploited through email in Thunderbird because scripting is disabled when reading mail, but it may present a risk in browser-like contexts.

Red Hat Enterprise Linux 5:
This vulnerability has been rated as having a security impact of Moderate. After evaluation and in accordance with the criteria noted in the product support life cycle, there are no plans to address this issue in an upcoming release. Please contact Red Hat Support for further information.

CVSS v3 metrics

NOTE: The following CVSS v3 metrics and score provided are preliminary and subject to review.

CVSS3 Base Score 6.1
CVSS3 Base Metrics CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Changed
Confidentiality Low
Integrity Impact Low
Availability Impact None

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux 8 (thunderbird) RHSA-2019:2774 2019-09-16
Red Hat Enterprise Linux 6 (thunderbird) RHSA-2019:2807 2019-09-19
Red Hat Enterprise Linux 7 (thunderbird) RHSA-2019:2773 2019-09-19
Red Hat Enterprise Linux 8 (firefox) RHSA-2019:2663 2019-09-04
Red Hat Enterprise Linux 6 (firefox) RHSA-2019:2694 2019-09-12
Red Hat Enterprise Linux 7 (firefox) RHSA-2019:2729 2019-09-12

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 5 firefox Out of support scope
Red Hat Enterprise Linux 5 thunderbird Out of support scope
Unless explicitly stated as not affected, all previous versions of packages in any minor update stream of a product listed here should be assumed vulnerable, although may not have been subject to full analysis.


Red Hat would like to thank the Mozilla project for reporting this issue. Upstream acknowledges Yoav Weiss as the original reporter.

External References

Last Modified

CVE description copyright © 2017, The MITRE Corporation