CVE-2026-74978
published 2026-08-18CVE-2026-74978: Clickjacking issue in the Widget component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
PriorityP341high8.1CVSS 3.1
AVNACLPRNUIRSUCHIHAN
EPSS
0.23%
13.8th percentile
Clickjacking issue in the Widget component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 154 | Firefox 154 |
| mozilla | firefox | < 153.1.0 | 153.1.0 |
| mozilla | firefox_esr | < Firefox ESR 153.1 | Firefox ESR 153.1 |
| mozilla | thunderbird | < Thunderbird 153.1 | Thunderbird 153.1 |
| mozilla | thunderbird | < Thunderbird 154 | Thunderbird 154 |
| mozilla | thunderbird | < 153.1.0 | 153.1.0 |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
vendor_redhat8.1HIGH
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Red Hat
firefox: thunderbird: Clickjacking issue in the Widget component
vendor_redhat·2026-08-18·CVSS 8.1
CVE-2026-74978 [HIGH] CWE-1021 firefox: thunderbird: Clickjacking issue in the Widget component
firefox: thunderbird: Clickjacking issue in the Widget component
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Clickjacking issue in the Widget 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: rhel10/thunderbird-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: thunderbird (Red Hat Enterprise Linux 6) - Not affected
Package: firefox (Red Hat
Mozilla
Mozilla Foundation Security Advisory 2026-80: CVE-2026-74978
vendor_mozilla
CVE-2026-74978 Mozilla Foundation Security Advisory 2026-80: CVE-2026-74978
Mozilla Foundation Security Advisory 2026-80
CVE: CVE-2026-74978
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-77: CVE-2026-74978
vendor_mozilla
CVE-2026-74978 Mozilla Foundation Security Advisory 2026-77: CVE-2026-74978
Mozilla Foundation Security Advisory 2026-77
CVE: CVE-2026-74978
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-78: CVE-2026-74978
vendor_mozilla
CVE-2026-74978 Mozilla Foundation Security Advisory 2026-78: CVE-2026-74978
Mozilla Foundation Security Advisory 2026-78
CVE: CVE-2026-74978
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 154
Mozilla
Mozilla Foundation Security Advisory 2026-74: CVE-2026-74978
vendor_mozilla
CVE-2026-74978 Mozilla Foundation Security Advisory 2026-74: CVE-2026-74978
Mozilla Foundation Security Advisory 2026-74
CVE: CVE-2026-74978
Product: Firefox
Impact: high
Fixed in: Firefox 154
GHSA
Clickjacking issue in the Widget component.
ghsa_unreviewed·2026-08-18
CVE-2026-74978 [HIGH] CWE-1021 Clickjacking issue in the Widget component.
Clickjacking issue in the Widget component. This vulnerability was fixed in Firefox 154 and Firefox ESR 153.1.
No detection rules found.
No public exploits indexed.
2026-08-18
Published