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{}

{"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"]}