CVE-2026-8963
published 2026-05-19CVE-2026-8963: Spoofing issue in the Web Speech component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
PriorityP340high7.5CVSS 3.1
AVNACLPRNUINSUCNIHAN
EPSS
0.30%
22.3th percentile
Spoofing issue in the Web Speech component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Affected
4 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 151 | Firefox 151 |
| mozilla | firefox | < 151.0.0 | 151.0.0 |
| mozilla | thunderbird | < Thunderbird 151 | Thunderbird 151 |
| mozilla | thunderbird | < 151.0.0 | 151.0.0 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
vendor_redhat7.5HIGH
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VulDB
Mozilla Firefox up to 150 Web Speech
vuldb·2026-05-19·CVSS 7.5
CVE-2026-8963 [HIGH] Mozilla Firefox up to 150 Web Speech
A vulnerability, which was classified as problematic, has been found in Mozilla Firefox up to 150. Affected by this issue is some unknown functionality of the component Web Speech. The manipulation leads to an unknown weakness.
This vulnerability is listed as CVE-2026-8963. The attack may be initiated remotely. There is no available exploit.
It is advisable to upgrade the affected component.
GHSA
GHSA-7f47-q24v-32rc: Spoofing issue in the Web Speech component
ghsa_unreviewed·2026-05-19
CVE-2026-8963 [HIGH] CWE-290 GHSA-7f47-q24v-32rc: Spoofing issue in the Web Speech component
Spoofing issue in the Web Speech component. This vulnerability was fixed in Firefox 151.
Red Hat
firefox: thunderbird: Spoofing issue in the Web Speech component
vendor_redhat·2026-05-19·CVSS 7.5
CVE-2026-8963 [HIGH] firefox: thunderbird: Spoofing issue in the Web Speech component
firefox: thunderbird: Spoofing issue in the Web Speech component
Spoofing issue in the Web Speech component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Spoofing issue in the Web Speech 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
Mozilla
Mozilla Foundation Security Advisory 2026-46: CVE-2026-8963
vendor_mozilla·CVSS 7.5
CVE-2026-8963 [HIGH] Mozilla Foundation Security Advisory 2026-46: CVE-2026-8963
Mozilla Foundation Security Advisory 2026-46
CVE: CVE-2026-8963
Product: Firefox
Impact: high
Fixed in: Firefox 151
Mozilla
Mozilla Foundation Security Advisory 2026-50: CVE-2026-8963
vendor_mozilla·CVSS 7.5
CVE-2026-8963 [HIGH] Mozilla Foundation Security Advisory 2026-50: CVE-2026-8963
Mozilla Foundation Security Advisory 2026-50
CVE: CVE-2026-8963
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 151
No detection rules found.
No public exploits indexed.
2026-05-19
Published