CVE-2026-4722
published 2026-03-24CVE-2026-4722: Privilege escalation in the IPC component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
PriorityP347high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.31%
23.3th percentile
Privilege escalation in the IPC component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
Affected
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | firefox | < firefox 149.0-1 (sid) | firefox 149.0-1 (sid) |
| mozilla | firefox | < 149.0 | 149.0 |
| mozilla | firefox | — | — |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
osv8.8HIGH
vendor_debian8.8HIGH
vendor_redhat8.8HIGH
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Red Hat
firefox: Privilege escalation in the IPC component
vendor_redhat·2026-03-24·CVSS 8.8
CVE-2026-4722 [HIGH] CWE-270 firefox: Privilege escalation in the IPC component
firefox: Privilege escalation in the IPC component
Privilege escalation in the IPC component. This vulnerability affects Firefox < 149 and Thunderbird < 149.
A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation in the IPC component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: firefox (Red Hat Enterprise Linux 10) - Not affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: firefox (Red Hat Enterprise Linux 6) - Not affected
Package: firefox (Red Hat Enterprise Linux 7) - Not affected
Package: firefox (Red Hat Enterprise Linux 8) - Not affected
Package: firefox (Red Hat Enterprise Li
Debian
CVE-2026-4722: firefox - Privilege escalation in the IPC component. This vulnerability affects Firefox < ...
vendor_debian·2026·CVSS 8.8
CVE-2026-4722 [HIGH] CVE-2026-4722: firefox - Privilege escalation in the IPC component. This vulnerability affects Firefox < ...
Privilege escalation in the IPC component. This vulnerability affects Firefox < 149 and Thunderbird < 149.
Scope: local
sid: resolved (fixed in 149.0-1)
Mozilla
Mozilla Foundation Security Advisory 2026-23: CVE-2026-4722
vendor_mozilla·CVSS 8.8
CVE-2026-4722 [HIGH] Mozilla Foundation Security Advisory 2026-23: CVE-2026-4722
Mozilla Foundation Security Advisory 2026-23
CVE: CVE-2026-4722
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 149
Mozilla
Mozilla Foundation Security Advisory 2026-20: CVE-2026-4722
vendor_mozilla·CVSS 8.8
CVE-2026-4722 [HIGH] Mozilla Foundation Security Advisory 2026-20: CVE-2026-4722
Mozilla Foundation Security Advisory 2026-20
CVE: CVE-2026-4722
Product: Firefox
Impact: high
Fixed in: Firefox 149
GHSA
GHSA-fmr6-7878-wx6p: Privilege escalation in the IPC component
ghsa_unreviewed·2026-03-24
CVE-2026-4722 [HIGH] GHSA-fmr6-7878-wx6p: Privilege escalation in the IPC component
Privilege escalation in the IPC component. This vulnerability affects Firefox < 149.
OSV
CVE-2026-4722: Privilege escalation in the IPC component
osv·2026-03-24·CVSS 8.8
CVE-2026-4722 [HIGH] CVE-2026-4722: Privilege escalation in the IPC component
Privilege escalation in the IPC component. This vulnerability affects Firefox < 149 and Thunderbird < 149.
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-4722 firefox: Privilege escalation in the IPC component
bugzilla·2026-03-24·CVSS 8.8
CVE-2026-4722 [HIGH] CVE-2026-4722 firefox: Privilege escalation in the IPC component
CVE-2026-4722 firefox: Privilege escalation in the IPC component
Privilege escalation in the IPC component. This vulnerability affects Firefox < 149.
Wiz
CVE-2026-4722 Impact, Exploitability, and Mitigation Steps | Wiz
blogs_wiz·CVSS 5.1
CVE-2026-4722 [MEDIUM] CVE-2026-4722 Impact, Exploitability, and Mitigation Steps | Wiz
## CVE-2026-4722 :
NixOS vulnerability analysis and mitigation
Privilege escalation in the IPC component. This vulnerability affects Firefox < 149 and Thunderbird < 149.
Source : NVD
## 8.8
Score
Published March 24, 2026
Severity HIGH
CNA Score 8.8
Affected Technologies
NixOS
Mozilla Firefox
Has Public Exploit No
Has CISA KEV Exploit No
CISA KEV Release Date N/A
CISA KEV Due Date N/A
Exploitation Probability Percentile (EPSS) 3.1
Exploitation Probability (EPSS) N/A
Affected packages and libraries
thunderbird
firefox
Sources
Chainguard Has Fix Added at: Mar 29, 2026
Homebrew Severity HIGH Has Fix Added at: Mar 26, 2026
Nix Severity HIGH Has Fix Added at: Mar 26, 2026
Ubuntu 22.04 Severity MEDIUM No Fix Added at: Mar 29, 2026
Linux Severity HIGH Has Fix Added at:
2026-03-24
Published