CVE-2026-16401
published 2026-07-21CVE-2026-16401: Privilege escalation in the Data Loss Prevention component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
PriorityP349high8.8CVSS 3.1
AVNACLPRNUIRSUCHIHAH
EPSS
0.21%
11.9th percentile
Privilege escalation in the Data Loss Prevention component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 153 | Firefox 153 |
| mozilla | firefox | < 153.0.0 | 153.0.0 |
| mozilla | thunderbird | < Thunderbird 153 | Thunderbird 153 |
| mozilla | thunderbird | < 153.0 | 153.0 |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
vendor_redhat8.8HIGH
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Red Hat
firefox: thunderbird: Privilege escalation in the Data Loss Prevention component
vendor_redhat·2026-07-21·CVSS 8.8
CVE-2026-16401 [HIGH] firefox: thunderbird: Privilege escalation in the Data Loss Prevention component
firefox: thunderbird: Privilege escalation in the Data Loss Prevention component
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Privilege escalation in the Data Loss Prevention 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: thunderbird (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: thunderb
Mozilla
Mozilla Foundation Security Advisory 2026-68: CVE-2026-16401
vendor_mozilla
CVE-2026-16401 Mozilla Foundation Security Advisory 2026-68: CVE-2026-16401
Mozilla Foundation Security Advisory 2026-68
CVE: CVE-2026-16401
Product: Firefox
Impact: high
Fixed in: Firefox 153
Mozilla
Mozilla Foundation Security Advisory 2026-71: CVE-2026-16401
vendor_mozilla
CVE-2026-16401 Mozilla Foundation Security Advisory 2026-71: CVE-2026-16401
Mozilla Foundation Security Advisory 2026-71
CVE: CVE-2026-16401
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153
GHSA
Privilege escalation in the Data Loss Prevention component.
ghsa_unreviewed·2026-07-21
CVE-2026-16401 [CRITICAL] CWE-269 Privilege escalation in the Data Loss Prevention component.
Privilege escalation in the Data Loss Prevention component. This vulnerability was fixed in Firefox 153.
No detection rules found.
No public exploits indexed.
2026-07-21
Published