CVE-2026-6779

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{"bugzilla": {"description": "JavaScript Engine: Firefox: Firefox: Unspecified vulnerability in JavaScript Engine", "id": "2460090", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460090"}, "csaw": false, "cvss3": {"cvss3_base_score": "8.8", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "details": ["A flaw was found in the JavaScript Engine component of Firefox. This issue, while not fully detailed, could potentially lead to an unspecified impact within the browser environment. The exact nature of the vulnerability and its potential for exploitation are not clearly defined in the available information."], "name": "CVE-2026-6779", "public_date": "2026-04-21T12:41:09Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-6779\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-6779\nhttps://bugzilla.mozilla.org/show_bug.cgi?id=2023343\nhttps://www.mozilla.org/security/advisories/mfsa2026-30/"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[150,*]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Firefox", "source": "cna", "vendor": "Mozilla"}, "product": "firefox", "vendor": "mozilla"}], "analysis": {"en": {"generated_at": "2026-04-22T05:42:53.571463+00:00", "value": {"mitigation_remediation": ["Upgrade Mozilla Firefox and Thunderbird to version 150 or later to apply the vendor fix.", "If an immediate upgrade is not possible, consider disabling JavaScript for untrusted content or applying a strict Content Security Policy to restrict script execution.", "Monitor the browser for crashes or anomalous behavior to confirm that the issue is adequately mitigated."], "summary": {"action": "Patch", "impact": "Unspecified Impact"}, "threat_synthesis": {"affected_systems": "Mozilla Firefox and Mozilla Thunderbird are affected. The issue existed in all releases prior to version 150 and was fixed in that release; no more granular version information is provided, so all revisions below 150 should be considered vulnerable.", "description_and_impact": "The vulnerability is identified as an \u2018Other issue\u2019 in the JavaScript Engine component of Mozilla products. The advisory does not provide a detailed technical description, so the exact nature of the flaw\u2014whether it results in a crash, memory corruption, or another form of failure\u2014is not disclosed. Users may encounter unexpected crashes or erratic browser behavior, but no confirmed remote code execution or data exfiltration is indicated.", "risk_and_exploitability": "The CVSS score is 5.3, indicating a medium severity. No EPSS score is available, and the vulnerability is not listed in the CISA KEV catalog. Attackers who can supply crafted JavaScript to a vulnerable client might attempt to trigger the bug, but without a detailed trigger or affected context the likelihood of successful exploitation remains uncertain. Administrators should treat the vulnerability as potentially high until further clarifying information is released."}}}}, "created": "2026-04-21T17:00:11.949184+00:00", "title": "Firefox JavaScript Engine Vulnerability with Unspecified Impact", "updated": "2026-04-22T05:45:09.828343+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox"], "weaknesses": ["CWE-119", "CWE-20", "CWE-79"]}