CVE-2026-74955: Privilege escalation in the Request Handling component
Published Aug 18, 2026
·Updated
Privilege escalation in the Request Handling component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.
Affected Software
4 affected componentsFixes available
Mozilla Firefox>=undefined
Mozilla Firefox ESR>=undefined
Mozilla Firefox<154
154
Mozilla Firefox ESR<153.1
153.1
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 154 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 153.1 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 154 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 153.1
Event History
Aug 18, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
Updated
via Mozilla·12:00 AM
Affected Software
CVE Published
via MITRE·12:23 PM
Data Sourced
via MITRE·12:23 PM
Description
Peer vulnerabilities
Found alongside the following vulnerabilities.
- CVE-2026-75874
- CVE-2026-74934
- CVE-2026-74935
- CVE-2026-74936
- CVE-2026-74937
- CVE-2026-74938
- CVE-2026-74939
- CVE-2026-74940
- CVE-2026-74941
- CVE-2026-74942
- CVE-2026-74943
- CVE-2026-74944
- CVE-2026-74945
- CVE-2026-74946
- CVE-2026-74947
- CVE-2026-74948
- CVE-2026-74949
- CVE-2026-74950
- CVE-2026-74951
- CVE-2026-74952
- CVE-2026-74953
- CVE-2026-74954
- CVE-2026-74955
- CVE-2026-74956
- CVE-2026-74957
- CVE-2026-74958
- CVE-2026-74959
- CVE-2026-74960
- CVE-2026-74961
- CVE-2026-74962
- CVE-2026-74963
- CVE-2026-74964
- CVE-2026-74965
- CVE-2026-74966
- CVE-2026-74967
- CVE-2026-74968
- CVE-2026-74969
- CVE-2026-74970
- CVE-2026-74971
- CVE-2026-74972
- CVE-2026-74973
- CVE-2026-74974
- CVE-2026-74975
- CVE-2026-74976
- CVE-2026-74977
- CVE-2026-74978
- CVE-2026-74979
- CVE-2026-74980
- CVE-2026-74981
- CVE-2026-74982
- CVE-2026-74983
- CVE-2026-74984
- CVE-2026-74985
- CVE-2026-74986
- CVE-2026-74987
- CVE-2026-74988
- CVE-2026-74989
- CVE-2026-74990
Frequently Asked Questions
1
Which Firefox releases contain the fix?
Mozilla states that the issue is fixed in Firefox 154 and Firefox ESR 153.1. Systems running those versions or later include the fix.