REDHAT-BUG-2503423: Medium severity Mozilla Firefox vulnerability
Published Jul 21, 2026
·Updated
Site isolation issue in the Networking: HTTP component. This vulnerability was fixed in Firefox 153 and Firefox ESR 140.13.
Affected Software
1 affected component
Mozilla Firefox<153, <140.13
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Firefox (Networking: HTTP)to a version that resolves this vulnerability.Fixed in 153 - Upgrade
Upgrade
Firefox ESR (Networking: HTTP)to a version that resolves this vulnerability.Fixed in 140.13
Event History
Jul 21, 2026
Data Sourced
via Red Hat·01:01 PM
DescriptionSeverityAffected Software
Frequently Asked Questions
1
What is the severity of REDHAT-BUG-2503423?
The severity of REDHAT-BUG-2503423 is categorized as medium with a score of 4.
2
How do I fix REDHAT-BUG-2503423?
To fix REDHAT-BUG-2503423, upgrade to Firefox version 153 or Firefox ESR version 140.13.
3
What component is affected by REDHAT-BUG-2503423?
REDHAT-BUG-2503423 affects the Networking: HTTP component.
4
When was REDHAT-BUG-2503423 published?
REDHAT-BUG-2503423 was published on July 21, 2026.
5
What issue does REDHAT-BUG-2503423 address?
REDHAT-BUG-2503423 addresses a site isolation issue in Mozilla Firefox.