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Esta vulnerabilidad afecta a Firefox < 148, Firefox ESR < 115.33, Firefox ESR < 140.8, Thunderbird < 148, y Thunderbird < 140.8."}], "id": "CVE-2026-2776", "lastModified": "2026-07-15T02:19:40.313", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 10.0, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 6.0, "source": "[email protected]", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 10.0, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": 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{"bugzilla": {"description": "firefox: Sandbox escape due to incorrect boundary conditions in the Telemetry component in External Software", "id": "2442291", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2442291"}, "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"}, "details": ["No description is available for this CVE."], "name": "CVE-2026-2776", "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:6", "fix_state": "Out of support scope", "package_name": "firefox", "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:8", "fix_state": "Affected", "package_name": "firefox", "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"}], "public_date": "2026-02-24T13:33:12Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-2776\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-2776\nhttps://www.mozilla.org/security/advisories/mfsa2026-15/#CVE-2026-2776"], "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": "[0,148)"}}], "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": "[0,115.33)"}}], "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": "[0,140.8)"}}], "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": "[0,148)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Thunderbird", "source": "cna", "vendor": "Mozilla"}, "product": "thunderbird", "vendor": "mozilla"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,140.8)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Thunderbird", "source": "cna", "vendor": "Mozilla"}, "product": "thunderbird", "vendor": "mozilla"}], "analysis": {"en": {"generated_at": "2026-04-15T15:32:11.783882+00:00", "value": {"mitigation_remediation": ["Upgrade Mozilla Firefox to version 148 or newer, or to Firefox ESR 115.33 or 140.8 where applicable.", "Upgrade Mozilla Thunderbird to version 148 or newer, or to Thunderbird ESR 140.8 where applicable.", "Ensure the organization\u2019s update policy automatically installs security patches, or apply the patch manually on all affected machines."], "summary": {"action": "Immediate Patch", "impact": "Sandbox escape, potentially allowing an attacker to gain file system access from a sandboxed process"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox (all releases, including ESR) and Mozilla Thunderbird (all releases, including ESR) are affected. The fix was applied in Firefox 148, Firefox ESR 115.33, Firefox ESR 140.8, Thunderbird 148, and Thunderbird 140.8. Earlier versions lack the necessary boundary checks and remain vulnerable.", "description_and_impact": "The vulnerability originates from improper boundary checks in the Telemetry component of Mozilla products. By exploiting this flaw, an attacker can escape from the security sandbox that normally isolates browser or email client processes, thereby potentially accessing the underlying file system or executing arbitrary code. This weakness falls under CWE-119 (Buffer Overflow or Corruption). The impact is a loss of confidentiality, integrity, and availability for users running affected versions.", "risk_and_exploitability": "The CVSS score is 10, indicating a critical level of risk. EPSS indicates a very low but non-zero exploitation probability (<1%). The vulnerability is not listed in CISA\u2019s KEV catalog. Attackers would likely deliver malicious content through a web page, extension, or phishing email that triggers the Telemetry component, after which they could use the sandbox escape to read or write arbitrary files. No additional attack prerequisites are noted beyond the presence of the vulnerable software."}}}}, "created": "2026-02-25T11:39:32.821028+00:00", "updated": "2026-04-15T17:15:10.568917+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$firefox_esr", "mozilla$PRODUCT$thunderbird"]}