{"id":"CVE-2025-1013","title":"A race condition could have led to private browsing tabs being opened in normal browsing windows","summary":"A race condition could have led to private browsing tabs being opened in normal browsing windows. This could have resulted in a potential privacy leak. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, an…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N","cwe":["CWE-362"],"vendor":"mozilla","product":"firefox","affected":["firefox < 128.7.0","firefox < 135.0","thunderbird < 128.7.0","thunderbird >= 129.0, < 135.0"],"patched":["firefox 135.0","thunderbird 135.0"],"published":"2025-02-04","updated":"2026-09-30","sourceUpdated":"2026-09-30T19:10:01.007","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-1013","references":[{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1932555","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-07/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-09/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-10/","label":"security@mozilla.org"},{"url":"https://www.mozilla.org/security/advisories/mfsa2025-11/","label":"security@mozilla.org"},{"url":"https://lists.debian.org/debian-lts-announce/2025/02/msg00006.html","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00325,"epssPercentile":0.23181,"ingestedAt":"2026-09-30T19:21:07.223Z","slug":"CVE-2025-1013","body":"## Overview\n\nA race condition could have led to private browsing tabs being opened in normal browsing windows. This could have resulted in a potential privacy leak. This vulnerability was fixed in Firefox 135, Firefox ESR 128.7, Thunderbird 128.7, and Thunderbird 135.\n\n## Affected\n\n- `firefox < 128.7.0`\n- `firefox < 135.0`\n- `thunderbird < 128.7.0`\n- `thunderbird >= 129.0, < 135.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `firefox 135.0`\n- `thunderbird 135.0`","depth":"sunlit","depthScore":36,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}