Bug 2503521 (CVE-2026-16396) - CVE-2026-16396 firefox: thunderbird: Privilege escalation in WebExtensions
Summary: CVE-2026-16396 firefox: thunderbird: Privilege escalation in WebExtensions
Keywords:
Status: NEW
Alias: CVE-2026-16396
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-07-21 13:05 UTC by OSIDB Bzimport
Modified: 2026-08-12 12:59 UTC (History)
5 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:47101 0 None None None 2026-07-28 16:09:57 UTC
Red Hat Product Errata RHSA-2026:47104 0 None None None 2026-07-29 01:39:50 UTC
Red Hat Product Errata RHSA-2026:47105 0 None None None 2026-07-28 21:14:30 UTC
Red Hat Product Errata RHSA-2026:49621 0 None None None 2026-08-03 10:24:02 UTC
Red Hat Product Errata RHSA-2026:49921 0 None None None 2026-08-04 08:59:41 UTC
Red Hat Product Errata RHSA-2026:49922 0 None None None 2026-08-04 08:44:19 UTC
Red Hat Product Errata RHSA-2026:53444 0 None None None 2026-08-11 13:44:55 UTC
Red Hat Product Errata RHSA-2026:53445 0 None None None 2026-08-11 13:03:35 UTC
Red Hat Product Errata RHSA-2026:53446 0 None None None 2026-08-11 13:45:22 UTC
Red Hat Product Errata RHSA-2026:53453 0 None None None 2026-08-11 14:22:06 UTC
Red Hat Product Errata RHSA-2026:53454 0 None None None 2026-08-11 14:22:15 UTC
Red Hat Product Errata RHSA-2026:53455 0 None None None 2026-08-11 13:58:59 UTC
Red Hat Product Errata RHSA-2026:53475 0 None None None 2026-08-11 14:29:51 UTC
Red Hat Product Errata RHSA-2026:54180 0 None None None 2026-08-12 06:59:51 UTC
Red Hat Product Errata RHSA-2026:54181 0 None None None 2026-08-12 07:14:32 UTC
Red Hat Product Errata RHSA-2026:54182 0 None None None 2026-08-12 07:14:48 UTC
Red Hat Product Errata RHSA-2026:54185 0 None None None 2026-08-12 07:04:30 UTC
Red Hat Product Errata RHSA-2026:54248 0 None None None 2026-08-12 10:18:46 UTC
Red Hat Product Errata RHSA-2026:54249 0 None None None 2026-08-12 09:57:35 UTC
Red Hat Product Errata RHSA-2026:54259 0 None None None 2026-08-12 09:44:56 UTC
Red Hat Product Errata RHSA-2026:54339 0 None None None 2026-08-12 12:59:54 UTC

Description OSIDB Bzimport 2026-07-21 13:05:28 UTC 
Privilege escalation in WebExtensions. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.
Comment 1 errata-xmlrpc 2026-07-28 16:09:56 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:47101 https://access.redhat.com/errata/RHSA-2026:47101
Comment 2 errata-xmlrpc 2026-07-28 21:14:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:47105 https://access.redhat.com/errata/RHSA-2026:47105
Comment 3 errata-xmlrpc 2026-07-29 01:39:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:47104 https://access.redhat.com/errata/RHSA-2026:47104
Comment 4 errata-xmlrpc 2026-08-03 10:24:01 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:49621 https://access.redhat.com/errata/RHSA-2026:49621
Comment 5 errata-xmlrpc 2026-08-04 08:44:17 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:49922 https://access.redhat.com/errata/RHSA-2026:49922
Comment 6 errata-xmlrpc 2026-08-04 08:59:40 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:49921 https://access.redhat.com/errata/RHSA-2026:49921
Comment 7 errata-xmlrpc 2026-08-11 13:03:33 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:53445 https://access.redhat.com/errata/RHSA-2026:53445
Comment 8 errata-xmlrpc 2026-08-11 13:44:54 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:53444 https://access.redhat.com/errata/RHSA-2026:53444
Comment 9 errata-xmlrpc 2026-08-11 13:45:21 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:53446 https://access.redhat.com/errata/RHSA-2026:53446
Comment 10 errata-xmlrpc 2026-08-11 13:58:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:53455 https://access.redhat.com/errata/RHSA-2026:53455
Comment 11 errata-xmlrpc 2026-08-11 14:22:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:53453 https://access.redhat.com/errata/RHSA-2026:53453
Comment 12 errata-xmlrpc 2026-08-11 14:22:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:53454 https://access.redhat.com/errata/RHSA-2026:53454
Comment 13 errata-xmlrpc 2026-08-11 14:29:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:53475 https://access.redhat.com/errata/RHSA-2026:53475
Comment 14 errata-xmlrpc 2026-08-12 06:59:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:54180 https://access.redhat.com/errata/RHSA-2026:54180
Comment 15 errata-xmlrpc 2026-08-12 07:04:29 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:54185 https://access.redhat.com/errata/RHSA-2026:54185
Comment 16 errata-xmlrpc 2026-08-12 07:14:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:54181 https://access.redhat.com/errata/RHSA-2026:54181
Comment 17 errata-xmlrpc 2026-08-12 07:14:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:54182 https://access.redhat.com/errata/RHSA-2026:54182
Comment 18 errata-xmlrpc 2026-08-12 09:44:55 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:54259 https://access.redhat.com/errata/RHSA-2026:54259
Comment 19 errata-xmlrpc 2026-08-12 09:57:34 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:54249 https://access.redhat.com/errata/RHSA-2026:54249
Comment 20 errata-xmlrpc 2026-08-12 10:18:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:54248 https://access.redhat.com/errata/RHSA-2026:54248
Comment 21 errata-xmlrpc 2026-08-12 12:59:53 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:54339 https://access.redhat.com/errata/RHSA-2026:54339
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