CVE-2026-12302
published 2026-06-16CVE-2026-12302: Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and…
PriorityP334medium6.5CVSS 3.1
AVNACLPRNUINSUCLILAN
EPSS
0.25%
16.0th percentile
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Firefox ESR 115.37, Thunderbird 152, and Thunderbird 140.12.
Affected
9 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 | firefox_esr | < Firefox ESR 115.37 | Firefox ESR 115.37 |
| mozilla | thunderbird | < Thunderbird 140.12 | Thunderbird 140.12 |
| mozilla | thunderbird | < Thunderbird 152 | Thunderbird 152 |
| mozilla | thunderbird | — | — |
| rhel10 | firefox-flatpak | — | — |
| rhel10 | thunderbird-flatpak | — | — |
CVSS provenance
nvdv3.16.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
vendor_redhat6.5MEDIUM
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VulDB
Mozilla Firefox up to 151 DOM Security Remote Code Execution (Nessus ID 321490)
vuldb·2026-06-18·CVSS 6.5
CVE-2026-12302 [MEDIUM] Mozilla Firefox up to 151 DOM Security Remote Code Execution (Nessus ID 321490)
A vulnerability labeled as critical has been found in Mozilla Firefox up to 151. The impacted element is an unknown function of the component DOM Security. Executing a manipulation can lead to Remote Code Execution.
This vulnerability is registered as CVE-2026-12302. It is possible to launch the attack remotely. No exploit is available.
The affected component should be upgraded.
GHSA
Mitigation bypass in the DOM: Security component.
ghsa_unreviewed·2026-06-16
CVE-2026-12302 [MEDIUM] CWE-693 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, and Firefox ESR 115.37.
Red Hat
firefox: thunderbird: Mitigation bypass in the DOM: Security component
vendor_redhat·2026-06-16·CVSS 6.5
CVE-2026-12302 [MEDIUM] 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, Firefox ESR 115.37, 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 Li
Mozilla
Mozilla Foundation Security Advisory 2026-58: CVE-2026-12302
vendor_mozilla·CVSS 6.5
CVE-2026-12302 [MEDIUM] Mozilla Foundation Security Advisory 2026-58: CVE-2026-12302
Mozilla Foundation Security Advisory 2026-58
CVE: CVE-2026-12302
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.12
Mozilla
Mozilla Foundation Security Advisory 2026-61: CVE-2026-12302
vendor_mozilla·CVSS 6.5
CVE-2026-12302 [MEDIUM] Mozilla Foundation Security Advisory 2026-61: CVE-2026-12302
Mozilla Foundation Security Advisory 2026-61
CVE: CVE-2026-12302
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.12
Mozilla
Mozilla Foundation Security Advisory 2026-59: CVE-2026-12302
vendor_mozilla·CVSS 6.5
CVE-2026-12302 [MEDIUM] Mozilla Foundation Security Advisory 2026-59: CVE-2026-12302
Mozilla Foundation Security Advisory 2026-59
CVE: CVE-2026-12302
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 115.37
Mozilla
Mozilla Foundation Security Advisory 2026-57: CVE-2026-12302
vendor_mozilla·CVSS 6.5
CVE-2026-12302 [MEDIUM] Mozilla Foundation Security Advisory 2026-57: CVE-2026-12302
Mozilla Foundation Security Advisory 2026-57
CVE: CVE-2026-12302
Product: Firefox
Impact: high
Fixed in: Firefox 152
Mozilla
Mozilla Foundation Security Advisory 2026-60: CVE-2026-12302
vendor_mozilla·CVSS 6.5
CVE-2026-12302 [MEDIUM] Mozilla Foundation Security Advisory 2026-60: CVE-2026-12302
Mozilla Foundation Security Advisory 2026-60
CVE: CVE-2026-12302
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 152
No detection rules found.
No public exploits indexed.
https://bugzilla.mozilla.org/show_bug.cgi?id=2034489https://www.mozilla.org/security/advisories/mfsa2026-57/https://www.mozilla.org/security/advisories/mfsa2026-58/https://www.mozilla.org/security/advisories/mfsa2026-59/https://www.mozilla.org/security/advisories/mfsa2026-60/https://www.mozilla.org/security/advisories/mfsa2026-61/
2026-06-16
Published