CVE-2026-74966
published 2026-08-18CVE-2026-74966: Information disclosure in the Form Autofill component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
PriorityP339high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
EPSS
0.26%
17.3th percentile
Information disclosure in the Form Autofill 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
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vendor_redhat7.5HIGH
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Red Hat
firefox: thunderbird: Information disclosure in the Form Autofill component
vendor_redhat·2026-08-18·CVSS 7.5
CVE-2026-74966 [HIGH] CWE-359 firefox: thunderbird: Information disclosure in the Form Autofill component
firefox: thunderbird: Information disclosure in the Form Autofill component
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Information disclosure in the Form Autofill 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
Pac
Mozilla
Mozilla Foundation Security Advisory 2026-80: CVE-2026-74966
vendor_mozilla
CVE-2026-74966 Mozilla Foundation Security Advisory 2026-80: CVE-2026-74966
Mozilla Foundation Security Advisory 2026-80
CVE: CVE-2026-74966
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 153.1
Mozilla
Mozilla Foundation Security Advisory 2026-74: CVE-2026-74966
vendor_mozilla
CVE-2026-74966 Mozilla Foundation Security Advisory 2026-74: CVE-2026-74966
Mozilla Foundation Security Advisory 2026-74
CVE: CVE-2026-74966
Product: Firefox
Impact: high
Fixed in: Firefox 154
Mozilla
Mozilla Foundation Security Advisory 2026-78: CVE-2026-74966
vendor_mozilla
CVE-2026-74966 Mozilla Foundation Security Advisory 2026-78: CVE-2026-74966
Mozilla Foundation Security Advisory 2026-78
CVE: CVE-2026-74966
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 154
Mozilla
Mozilla Foundation Security Advisory 2026-77: CVE-2026-74966
vendor_mozilla
CVE-2026-74966 Mozilla Foundation Security Advisory 2026-77: CVE-2026-74966
Mozilla Foundation Security Advisory 2026-77
CVE: CVE-2026-74966
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 153.1
VulDB
Mozilla Firefox prior 153.1/154 Form Autofill information disclosure (Nessus ID 338144)
vuldb·2026-08-25·CVSS 7.5
CVE-2026-74966 [HIGH] Mozilla Firefox prior 153.1/154 Form Autofill information disclosure (Nessus ID 338144)
A vulnerability classified as problematic has been found in Mozilla Firefox. The impacted element is an unknown function of the component Form Autofill. The manipulation leads to information disclosure.
This vulnerability is uniquely identified as CVE-2026-74966. The attack is possible to be carried out remotely. No exploit exists.
It is recommended to upgrade the affected component.
GHSA
Information disclosure in the Form Autofill component.
ghsa_unreviewed·2026-08-18
CVE-2026-74966 Information disclosure in the Form Autofill component.
Information disclosure in the Form Autofill 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