CVE-2026-109756: Privilege escalation in the DOM: Navigation component
Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 158, Firefox ESR 153.5, Thunderbird 158, and Thunderbird 153.5.
Other sources
Privilege escalation in the DOM: Navigation component. This vulnerability was fixed in Firefox 158 and Firefox ESR 153.5.
— Red Hat
Affected Software
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 153.5 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 158 - Upgrade
Upgrade
debian/firefoxto a version that resolves this vulnerability.Fixed in 159.0-1 - Upgrade
Upgrade
debian/firefox-esrto a version that resolves this vulnerability.Fixed in 153.6.0esr-1~deb12u2Fixed in 153.6.0esr-1~deb13u1Fixed in 153.5.1esr-1Fixed in 153.6.0esr-1 - Upgrade
Upgrade
debian/thunderbirdto a version that resolves this vulnerability.Fixed in 1:153.6.0esr-1~deb12u2Fixed in 1:153.6.0esr-1~deb13u1Fixed in 1:153.5.0esr-1Fixed in 1:153.6.0esr-1 - Upgrade
Upgrade
Firefoxto a version that resolves this vulnerability.Fixed in 158 - Upgrade
Upgrade
Firefox ESRto a version that resolves this vulnerability.Fixed in 153.5 - Upgrade
Upgrade
Thunderbirdto a version that resolves this vulnerability.Fixed in 158 - Upgrade
Upgrade
Thunderbird ESRto a version that resolves this vulnerability.Fixed in 153.5
Event History
Parent advisories
This vulnerability appears in the following advisories.
Peer vulnerabilities
Found alongside the following vulnerabilities.
- CVE-2026-110249
- CVE-2026-109704
- CVE-2026-109705
- CVE-2026-109706
- CVE-2026-109707
- CVE-2026-109708
- CVE-2026-109709
- CVE-2026-109710
- CVE-2026-109711
- CVE-2026-109712
- CVE-2026-109713
- CVE-2026-109715
- CVE-2026-109716
- CVE-2026-109717
- CVE-2026-109718
- CVE-2026-109719
- CVE-2026-109720
- CVE-2026-109721
- CVE-2026-109722
- CVE-2026-109723
- CVE-2026-109724
- CVE-2026-109725
- CVE-2026-109726
- CVE-2026-109727
- CVE-2026-109728
- CVE-2026-109729
- CVE-2026-109730
- CVE-2026-109731
- CVE-2026-109732
- CVE-2026-109733
- CVE-2026-109734
- CVE-2026-109736
- CVE-2026-109737
- CVE-2026-109738
- CVE-2026-109740
- CVE-2026-109741
- CVE-2026-109742
- CVE-2026-109743
- CVE-2026-109744
- CVE-2026-109745
- CVE-2026-109782
- CVE-2026-109751
- CVE-2026-109752
- CVE-2026-109753
- CVE-2026-109754
- CVE-2026-109756
- CVE-2026-109757
- CVE-2026-109759
- CVE-2026-109760
- CVE-2026-109762
- CVE-2026-109763
- CVE-2026-109764
- CVE-2026-109765
- CVE-2026-109766
- CVE-2026-109767
- CVE-2026-109783
- CVE-2026-109770
- CVE-2026-109775
- CVE-2026-109776
- CVE-2026-109777
- CVE-2026-109778
- CVE-2026-109781
- CVE-2026-109714
- CVE-2026-109735
- CVE-2026-109739
- CVE-2026-109746
- CVE-2026-109747
- CVE-2026-109748
- CVE-2026-109749
- CVE-2026-109750
- CVE-2026-109755
- CVE-2026-109761
- CVE-2026-109768
- CVE-2026-109769
- CVE-2026-109771
- CVE-2026-109772
- CVE-2026-109773
- CVE-2026-109774
- CVE-2026-109779
- CVE-2026-109780
- CVE-2026-110247
- CVE-2026-106016
- DLA-4836-1
- DLA-4863-1
Frequently Asked Questions
What does an attacker need to exploit this issue?
The CVSS vector indicates the attacker can operate over the network, requires no prior privileges, and needs user interaction. The impact can include high confidentiality, integrity, and availability impact.
Which Firefox releases contain the fix?
Mozilla fixed the issue in Firefox 158 and Firefox ESR 153.5.
How should organizations determine whether they need to remediate?
Identify deployed Firefox and Firefox ESR versions and compare them with Firefox 158 and Firefox ESR 153.5, respectively. Systems that have not received these fixes should be prioritized for update.