Description
Privilege escalation in the Data Loss Prevention component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.
Affected products
mozilla: firefox; mozilla: thunderbird
References3
- www.mozilla.org/security/advisories/mfsa2026-68/ Vendor Advisory
- www.mozilla.org/security/advisories/mfsa2026-71/ Vendor Advisory
- bugzilla.mozilla.org/show_bug.cgi?id=2052565 Permissions Required
Metrics
- CVSS 3.1
-
8.8
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 0% percentile: 35 · as of 14 November 2026
- CWE
- CWE-269
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.