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{"bugzilla": {"description": "firefox: thunderbird: Sandbox escape in the Responsive Design Mode component", "id": "2450748", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2450748"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-653", "details": ["A flaw was found in Firefox and Thunderbird. The Mozilla Foundation's Security Advisory describes the following issue:\nSandbox escape in the Responsive Design Mode component"], "name": "CVE-2026-4692", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "rhel10/firefox-flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "rhel10/thunderbird-flatpak", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "firefox", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "thunderbird", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-03-24T12:30:24Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4692\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4692\nhttps://www.mozilla.org/security/advisories/mfsa2026-22/#CVE-2026-4692\nhttps://www.mozilla.org/security/advisories/mfsa2026-24/#CVE-2026-4692"], "statement": "Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,149)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox", "source": "cna", "vendor": "Mozilla"}, "product": "firefox", "vendor": "mozilla"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,115.34)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox ESR", "source": "cna", "vendor": "Mozilla"}, "product": "firefox_esr", "vendor": "mozilla"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,140.9)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox ESR", "source": "cna", "vendor": "Mozilla"}, "product": "firefox_esr", "vendor": "mozilla"}], "analysis": {"en": {"generated_at": "2026-03-25T16:27:05.079070+00:00", "value": {"mitigation_remediation": ["Upgrade to Firefox 149 or later, or Firefox ESR 115.34 or newer; likewise upgrade Thunderbird to 149 or newer or Thunderbird ESR 140.9 or newer.", "Verify that the update installed by checking the build ID via About:Support.", "If an update cannot be applied immediately, consider disabling developer tools\u2014or at least hide the Responsive Design Mode\u2014until a patch is available."], "summary": {"action": "Immediate Patch", "impact": "Remote Code Execution"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox versions prior to 149, as well as Firefox Extended Support Release versions earlier than 115.34 and 140.9. Mozilla Thunderbird versions earlier than 149 and 140.9 are also affected. These product families are affected by the same browser component that implements the Responsive Design Mode feature.", "description_and_impact": "The vulnerability is a sandbox escape in the Responsive Design Mode component used in Firefox and Thunderbird. A flaw allows an attacker to break out of the browser sandbox and execute arbitrary code with the privileges of the user\u2019s process. The flaw is high\u2011severity, with a CVSS score of 9.6, meaning the potential impact includes full compromise of the affected machine, including confidentiality, integrity, and availability.", "risk_and_exploitability": "The CVE has an EPSS rating below 1\u202f%, indicating low current exploitation activity, but its high CVSS score makes it a priority target for attackers. The issue was not reported in the CISA KEV catalog. Based on the description, the likely attack vector involves a local or remote malicious webpage that activates Responsive Design Mode, after which the sandbox escape flaw can be triggered. An exploit would require the user to open a page that uses the responsive design mode, giving attackers a path to execute code in the context of the browser process."}}}}, "created": "2026-03-25T11:48:16.425997+00:00", "updated": "2026-03-25T20:50:52.700329+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$firefox_esr"], "weaknesses": ["CWE-285"]}