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{"analysis": {"en": {"generated_at": "2026-04-20T19:13:51.326624+00:00", "value": {"mitigation_remediation": ["Upgrade Firefox to version\u00a0144 or newer, or to the 115.29/140.4 ESR releases if using a long\u2011term support channel.", "Upgrade Thunderbird to version\u00a0144 or newer, or to the 140.4 ESR release if on a long\u2011term channel.", "Until the update propagates, disable or restrict JavaScript execution for untrusted content and monitor Mozilla security advisories for each platform."], "summary": {"action": "Patch Immediately", "impact": "Modification of non\u2011writable JavaScript object properties, enabling unintended behavior and potential data leakage"}, "threat_synthesis": {"affected_systems": "Firefox versions prior to 144 and ESR 115.29/140.4, Thunderbird versions prior to 144 and ESR 140.4 are affected. Upgrades to the specified release numbers or later mitigate the issue.", "description_and_impact": "Mozilla browsers and mail clients allowed users to change the values of JavaScript object properties that were intended to be non\u2011writeable. This flaw means that a malicious script could alter critical runtime data used by Firefox or Thunderbird, potentially compromising integrity, revealing private information, or enabling further code execution. The weakness falls under access control (CWE\u2011284) and incorrect handling of sensitive data (CWE\u2011591). Based on the description, it is inferred that a malicious script could manipulate these properties by executing JavaScript with sufficient privileges within the application.", "risk_and_exploitability": "The CVSS score of 6.5 indicates a medium severity vulnerability. The EPSS score is below 1\u202f%, suggesting that exploitation activity is presently rare. It is not listed in the CISA KEV catalogue, so no documented exploits are known. Based on the description, it is inferred that ground\u2011truth exploitation would likely require an attacker to inject or run privileged JavaScript within the affected application; this represents a medium risk for end\u2011users who navigate the open Web. Organizations should consider the risk based on their exposure to untrusted content."}}}}, "created": "2025-10-20T15:49:29.151343+00:00", "updated": "2026-04-20T19:15:15.052483+00:00", "vendors": ["mozilla", "mozilla$PRODUCT$firefox", "mozilla$PRODUCT$firefox_esr", "mozilla$PRODUCT$thunderbird"]}