CVE-2026-92019
published 2026-09-15CVE-2026-92019: Mitigation bypass in the Remote Settings Client component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR…
PriorityP343high8.1CVSS 3.1
AVNACLPRNUIRSUCHIHAN
EPSS
0.31%
21.8th percentile
Mitigation bypass in the Remote Settings Client component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
Affected
18 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 156 | Firefox 156 |
| mozilla | firefox | < 115.41.0 | 115.41.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 116.0 < 140.16.0 | 140.16.0 |
| mozilla | firefox | >= 141.0 < 153.3.0 | 153.3.0 |
| mozilla | firefox | >= 154.0.0 < 156.0.0 | 156.0.0 |
| mozilla | firefox_esr | < Firefox ESR 153.3 | Firefox ESR 153.3 |
| mozilla | firefox_esr | < Firefox ESR 140.16 | Firefox ESR 140.16 |
| mozilla | firefox_esr | < Firefox ESR 115.41 | Firefox ESR 115.41 |
| mozilla | thunderbird | < Thunderbird 140.16 | Thunderbird 140.16 |
| mozilla | thunderbird | < Thunderbird 153.3 | Thunderbird 153.3 |
| mozilla | thunderbird | < Thunderbird 156 | Thunderbird 156 |
| mozilla | thunderbird | < 140.16.0 | 140.16.0 |
| mozilla | thunderbird | — | — |
| mozilla | thunderbird | >= 141.0 < 153.3.0 | 153.3.0 |
| mozilla | thunderbird | >= 154.0 < 156.0 | 156.0 |
| rhel10 | firefox-flatpak | — | — |
| rhel10 | thunderbird-flatpak | — | — |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
vendor_redhat7.5HIGH
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Red Hat
firefox: thunderbird: Mitigation bypass in the Remote Settings Client component
vendor_redhat·2026-09-15·CVSS 7.5
CVE-2026-92019 [HIGH] CWE-807 firefox: thunderbird: Mitigation bypass in the Remote Settings Client component
firefox: thunderbird: Mitigation bypass in the Remote Settings Client component
Mitigation bypass in the Remote Settings Client component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, Firefox ESR 153.3, Thunderbird 156, Thunderbird 140.16, and Thunderbird 153.3.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Mitigation bypass in the Remote Settings Client 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) - Affected
Package: rhel10/firefox-flatpak (Red Hat Enterprise Linux 10) - Affected
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise
Mozilla
Mozilla Foundation Security Advisory 2026-95: CVE-2026-92019
vendor_mozilla
CVE-2026-92019 Mozilla Foundation Security Advisory 2026-95: CVE-2026-92019
Mozilla Foundation Security Advisory 2026-95
CVE: CVE-2026-92019
Product: Thunderbird
Impact: moderate
Fixed in: Thunderbird 140.16
Mozilla
Mozilla Foundation Security Advisory 2026-96: CVE-2026-92019
vendor_mozilla
CVE-2026-92019 Mozilla Foundation Security Advisory 2026-96: CVE-2026-92019
Mozilla Foundation Security Advisory 2026-96
CVE: CVE-2026-92019
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-94: CVE-2026-92019
vendor_mozilla
CVE-2026-92019 Mozilla Foundation Security Advisory 2026-94: CVE-2026-92019
Mozilla Foundation Security Advisory 2026-94
CVE: CVE-2026-92019
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 156
Mozilla
Mozilla Foundation Security Advisory 2026-93: CVE-2026-92019
vendor_mozilla
CVE-2026-92019 Mozilla Foundation Security Advisory 2026-93: CVE-2026-92019
Mozilla Foundation Security Advisory 2026-93
CVE: CVE-2026-92019
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-92: CVE-2026-92019
vendor_mozilla
CVE-2026-92019 Mozilla Foundation Security Advisory 2026-92: CVE-2026-92019
Mozilla Foundation Security Advisory 2026-92
CVE: CVE-2026-92019
Product: Firefox ESR
Impact: moderate
Fixed in: Firefox ESR 140.16
Mozilla
Mozilla Foundation Security Advisory 2026-91: CVE-2026-92019
vendor_mozilla
CVE-2026-92019 Mozilla Foundation Security Advisory 2026-91: CVE-2026-92019
Mozilla Foundation Security Advisory 2026-91
CVE: CVE-2026-92019
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.41
Mozilla
Mozilla Foundation Security Advisory 2026-90: CVE-2026-92019
vendor_mozilla
CVE-2026-92019 Mozilla Foundation Security Advisory 2026-90: CVE-2026-92019
Mozilla Foundation Security Advisory 2026-90
CVE: CVE-2026-92019
Product: Firefox
Impact: low
Fixed in: Firefox 156
VulDB
Mozilla Firefox up to 115.40/140.15/153.2/155 Remote Settings Client unnecessary privileges (WID-SEC-2026-3375)
vuldb·2026-09-22·CVSS 8.1
CVE-2026-92019 [HIGH] Mozilla Firefox up to 115.40/140.15/153.2/155 Remote Settings Client unnecessary privileges (WID-SEC-2026-3375)
A vulnerability was found in Mozilla Firefox up to 115.40/140.15/153.2/155. It has been declared as critical. Affected is an unknown function of the component Remote Settings Client. The manipulation results in execution with unnecessary privileges.
This vulnerability is reported as CVE-2026-92019. The attack can be launched remotely. No exploit exists.
It is recommended to upgrade the affected component.
GHSA
Mitigation bypass in the Remote Settings Client component.
ghsa_unreviewed·2026-09-15
CVE-2026-92019 Mitigation bypass in the Remote Settings Client component.
Mitigation bypass in the Remote Settings Client component. This vulnerability was fixed in Firefox 156, Firefox ESR 115.41, Firefox ESR 140.16, and Firefox ESR 153.3.
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=2065636https://www.mozilla.org/security/advisories/mfsa2026-90/https://www.mozilla.org/security/advisories/mfsa2026-91/https://www.mozilla.org/security/advisories/mfsa2026-92/https://www.mozilla.org/security/advisories/mfsa2026-93/https://www.mozilla.org/security/advisories/mfsa2026-94/https://www.mozilla.org/security/advisories/mfsa2026-95/https://www.mozilla.org/security/advisories/mfsa2026-96/
2026-09-15
Published