Bug 2550459 (CVE-2026-109778) - CVE-2026-109778 firefox: Privilege escalation in the WebExtensions component
Summary: CVE-2026-109778 firefox: Privilege escalation in the WebExtensions component
Keywords:
Status: NEW
Alias: CVE-2026-109778
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-10-13 13:05 UTC by OSIDB Bzimport
Modified: 2026-11-02 02:56 UTC (History)
5 users (show)

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

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:93443 0 None None None 2026-11-02 02:56:25 UTC

Description OSIDB Bzimport 2026-10-13 13:05:28 UTC 
Privilege escalation in the WebExtensions component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.
Comment 1 Jon Orris 2026-11-02 02:56:24 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:93443 https://access.redhat.com/errata/RHSA-2026:93443
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