CVE-2026-92074
published 2026-09-15CVE-2026-92074: Mitigation bypass in the Popup Blocker component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
PriorityP346high8.8CVSS 3.1
AVLACLPRLUINSCCHIHAH
EPSS
0.11%
1.1th percentile
Mitigation bypass in the Popup Blocker component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 156 | Firefox 156 |
| mozilla | firefox | < 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 | thunderbird | < Thunderbird 153.3 | Thunderbird 153.3 |
| mozilla | thunderbird | < Thunderbird 156 | Thunderbird 156 |
| mozilla | thunderbird | < 153.3.0 | 153.3.0 |
| mozilla | thunderbird | >= 154.0 < 156.0 | 156.0 |
CVSS provenance
nvdv3.18.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
vendor_redhat3.4LOW
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Red Hat
firefox: thunderbird: Mitigation bypass in the Popup Blocker component
vendor_redhat·2026-09-15·CVSS 3.4
CVE-2026-92074 [LOW] CWE-807 firefox: thunderbird: Mitigation bypass in the Popup Blocker component
firefox: thunderbird: Mitigation bypass in the Popup Blocker component
Mitigation bypass in the Popup Blocker component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, 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 Popup Blocker component
Statement: Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.
Package: rhel10/thunderbird-flatpak (Red Hat Enterprise Linux 10) - Not affected
Package: thunderbird (Red Hat Enterprise Linux 10) - Not affected
Package: thunderbird (Red Hat Enterprise Linux 6) - Not affected
Package: thunderbird (Red Hat Enterprise Linux 7) - Not affec
Mozilla
Mozilla Foundation Security Advisory 2026-90: CVE-2026-92074
vendor_mozilla
CVE-2026-92074 Mozilla Foundation Security Advisory 2026-90: CVE-2026-92074
Mozilla Foundation Security Advisory 2026-90
CVE: CVE-2026-92074
Product: Firefox
Impact: low
Fixed in: Firefox 156
Mozilla
Mozilla Foundation Security Advisory 2026-96: CVE-2026-92074
vendor_mozilla
CVE-2026-92074 Mozilla Foundation Security Advisory 2026-96: CVE-2026-92074
Mozilla Foundation Security Advisory 2026-96
CVE: CVE-2026-92074
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 153.3
Mozilla
Mozilla Foundation Security Advisory 2026-94: CVE-2026-92074
vendor_mozilla
CVE-2026-92074 Mozilla Foundation Security Advisory 2026-94: CVE-2026-92074
Mozilla Foundation Security Advisory 2026-94
CVE: CVE-2026-92074
Product: Thunderbird
Impact: low
Fixed in: Thunderbird 156
Mozilla
Mozilla Foundation Security Advisory 2026-93: CVE-2026-92074
vendor_mozilla
CVE-2026-92074 Mozilla Foundation Security Advisory 2026-93: CVE-2026-92074
Mozilla Foundation Security Advisory 2026-93
CVE: CVE-2026-92074
Product: Firefox ESR
Impact: low
Fixed in: Firefox ESR 153.3
GHSA
Mitigation bypass in the Popup Blocker component.
ghsa_unreviewed·2026-09-15
CVE-2026-92074 Mitigation bypass in the Popup Blocker component.
Mitigation bypass in the Popup Blocker component. This vulnerability was fixed in Firefox 156 and Firefox ESR 153.3.
No detection rules found.
No public exploits indexed.
2026-09-15
Published