CVE-2026-12311
published 2026-06-16CVE-2026-12311: Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12…
PriorityP422medium4.7CVSS 3.1
AVNACLPRNUIRSCCLINAN
EPSS
0.18%
8.3th percentile
Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| mozilla | firefox | < Firefox 152 | Firefox 152 |
| mozilla | firefox | < 152.0 | 152.0 |
| mozilla | firefox | — | — |
| mozilla | firefox | >= 140.0 < 140.12.0 | 140.12.0 |
| mozilla | firefox_esr | < Firefox ESR 140.12 | Firefox ESR 140.12 |
| mozilla | thunderbird | < Thunderbird 140.12 | Thunderbird 140.12 |
| mozilla | thunderbird | < Thunderbird 152 | Thunderbird 152 |
| mozilla | thunderbird | < 152.0.0 | 152.0.0 |
| mozilla | thunderbird | — | — |
| mozilla | thunderbird | >= 140.0 < 140.12.0 | 140.12.0 |
| rhel10 | firefox-flatpak | — | — |
| rhel10 | thunderbird-flatpak | — | — |
CVSS provenance
nvdv3.14.7MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:N/A:N
vendor_redhat4.7MEDIUM
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VulDB
Mozilla Firefox up to 140.11/151 Process Sandboxing sandbox (Nessus ID 321490)
vuldb·2026-06-19·CVSS 4.7
CVE-2026-12311 [MEDIUM] Mozilla Firefox up to 140.11/151 Process Sandboxing sandbox (Nessus ID 321490)
A vulnerability was found in Mozilla Firefox up to 140.11/151. It has been rated as critical. Affected is an unknown function of the component Process Sandboxing. The manipulation leads to sandbox issue.
This vulnerability is referenced as CVE-2026-12311. Remote exploitation of the attack is possible. No exploit is available.
Upgrading the affected component is advised.
GHSA
Information disclosure, sandbox escape in the Security: Process Sandboxing component.
ghsa_unreviewed·2026-06-16
CVE-2026-12311 [MEDIUM] CWE-200 Information disclosure, sandbox escape in the Security: Process Sandboxing component.
Information disclosure, sandbox escape in the Security: Process Sandboxing component. This vulnerability was fixed in Firefox 152 and Firefox ESR 140.12.
Red Hat
firefox: thunderbird: Information disclosure, sandbox escape in the Security: Process Sandboxing component
vendor_redhat·2026-06-16·CVSS 4.7
CVE-2026-12311 [MEDIUM] CWE-243 firefox: thunderbird: Information disclosure, sandbox escape in the Security: Process Sandboxing component
firefox: thunderbird: Information disclosure, sandbox escape in the Security: Process Sandboxing component
Information disclosure, sandbox escape in the Security: Process Sandboxing 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:
Information disclosure, sandbox escape in the Security: Process Sandboxing 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-flatp
Mozilla
Mozilla Foundation Security Advisory 2026-61: CVE-2026-12311
vendor_mozilla·CVSS 4.7
CVE-2026-12311 [MEDIUM] Mozilla Foundation Security Advisory 2026-61: CVE-2026-12311
Mozilla Foundation Security Advisory 2026-61
CVE: CVE-2026-12311
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 140.12
Mozilla
Mozilla Foundation Security Advisory 2026-60: CVE-2026-12311
vendor_mozilla·CVSS 4.7
CVE-2026-12311 [MEDIUM] Mozilla Foundation Security Advisory 2026-60: CVE-2026-12311
Mozilla Foundation Security Advisory 2026-60
CVE: CVE-2026-12311
Product: Thunderbird
Impact: high
Fixed in: Thunderbird 152
Mozilla
Mozilla Foundation Security Advisory 2026-57: CVE-2026-12311
vendor_mozilla·CVSS 4.7
CVE-2026-12311 [MEDIUM] Mozilla Foundation Security Advisory 2026-57: CVE-2026-12311
Mozilla Foundation Security Advisory 2026-57
CVE: CVE-2026-12311
Product: Firefox
Impact: high
Fixed in: Firefox 152
Mozilla
Mozilla Foundation Security Advisory 2026-58: CVE-2026-12311
vendor_mozilla·CVSS 4.7
CVE-2026-12311 [MEDIUM] Mozilla Foundation Security Advisory 2026-58: CVE-2026-12311
Mozilla Foundation Security Advisory 2026-58
CVE: CVE-2026-12311
Product: Firefox ESR
Impact: high
Fixed in: Firefox ESR 140.12
No detection rules found.
No public exploits indexed.
2026-06-16
Published