CVE-2026-12315
published 2026-06-16CVE-2026-12315: Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
PriorityP352critical9.1CVSS 3.1
AVNACLPRNUINSUCHIHAN
EPSS
0.25%
16.4th percentile
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 152 | Firefox 152 |
| mozilla | firefox | — | — |
| mozilla | firefox_esr | < Firefox ESR 140.12 | Firefox ESR 140.12 |
| mozilla | thunderbird | < Thunderbird 152 | Thunderbird 152 |
| mozilla | thunderbird | < Thunderbird 140.12 | Thunderbird 140.12 |
| mozilla | thunderbird | — | — |
| rhel10 | firefox-flatpak | — | — |
| rhel10 | thunderbird-flatpak | — | — |
CVSS provenance
nvdv3.19.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
vendor_redhat9.1CRITICAL
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VulDB
Mozilla Firefox up to 151 DOM Security Remote Code Execution (Nessus ID 321490 / WID-SEC-2026-1959)
vuldb·2026-07-09·CVSS 9.1
CVE-2026-12315 [CRITICAL] Mozilla Firefox up to 151 DOM Security Remote Code Execution (Nessus ID 321490 / WID-SEC-2026-1959)
A vulnerability identified as critical has been detected in Mozilla Firefox up to 151. Affected by this issue is some unknown functionality of the component DOM Security. This manipulation causes Remote Code Execution.
This vulnerability is tracked as CVE-2026-12315. The attack is possible to be carried out remotely. No exploit exists.
You should upgrade the affected component.
GHSA
Mitigation bypass in the DOM: Security component.
ghsa_unreviewed·2026-06-16
CVE-2026-12315 [CRITICAL] CWE-693 Mitigation bypass in the DOM: Security component.
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12.
Red Hat
firefox: thunderbird: Mitigation bypass in the DOM: Security component
vendor_redhat·2026-06-16·CVSS 9.1
CVE-2026-12315 [CRITICAL] CWE-807 firefox: thunderbird: Mitigation bypass in the DOM: Security component
firefox: thunderbird: Mitigation bypass in the DOM: Security component
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:
Mitigation bypass in the DOM: Security 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 Linux 10) - Affected
Package: thunderbird (Red Hat Enterprise Linux 10) - Affected
Mozilla
Mozilla Foundation Security Advisory 2026-58: CVE-2026-12315
vendor_mozilla·CVSS 9.1
CVE-2026-12315 [CRITICAL] Mozilla Foundation Security Advisory 2026-58: CVE-2026-12315
Mozilla Foundation Security Advisory 2026-58
CVE: CVE-2026-12315
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.12
Mozilla
Mozilla Foundation Security Advisory 2026-60: CVE-2026-12315
vendor_mozilla·CVSS 9.1
CVE-2026-12315 [CRITICAL] Mozilla Foundation Security Advisory 2026-60: CVE-2026-12315
Mozilla Foundation Security Advisory 2026-60
CVE: CVE-2026-12315
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 152
Mozilla
Mozilla Foundation Security Advisory 2026-57: CVE-2026-12315
vendor_mozilla·CVSS 9.1
CVE-2026-12315 [CRITICAL] Mozilla Foundation Security Advisory 2026-57: CVE-2026-12315
Mozilla Foundation Security Advisory 2026-57
CVE: CVE-2026-12315
Product: Firefox
Impact: high
Fixed in: Firefox 152
Mozilla
Mozilla Foundation Security Advisory 2026-61: CVE-2026-12315
vendor_mozilla·CVSS 9.1
CVE-2026-12315 [CRITICAL] Mozilla Foundation Security Advisory 2026-61: CVE-2026-12315
Mozilla Foundation Security Advisory 2026-61
CVE: CVE-2026-12315
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.12
No detection rules found.
No public exploits indexed.
2026-06-16
Published