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Insufficient escaping in the “Copy as cURL” feature could have been used to trick a user into executing unexpected code on Windows. This did not affect the application when running on other operating systems. This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Mfsa2025 81 | — | Upgrade to Mozilla Firefox version 144.0Upgrade to the latest version of Mozilla Firefox | Oct 15, 2025 | Oct 14, 2025 |
| Mfsa2025 83 | — | Upgrade to Mozilla Firefox ESR version 140.4Upgrade to the latest version of Mozilla Firefox | Oct 15, 2025 | Oct 14, 2025 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 140.4 | Oct 15, 2025 | Oct 14, 2025 |
| Suse | — | Upgrade MozillaFirefox-translations-otherUpgrade mozillafirefox-branding-upstreamUpgrade MozillaThunderbird-translations-otherUpgrade MozillaFirefoxUpgrade MozillaFirefox-develUpgrade MozillaFirefox-translations-commonUpgrade MozillaThunderbirdUpgrade MozillaThunderbird-translations-commonUpgrade MozillaThunderbird-openpgp-librnp | Dec 5, 2025 | Nov 10, 2025 |
| Ubuntu | — | Upgrade thunderbird | Feb 4, 2026 | Feb 2, 2026 |
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