{"cve":"CVE-2026-4687","nvd":{"published":"2026-03-24T13:16:04.537","modified":"2026-07-15T02:22:45.890","status":"Modified","description":"Sandbox escape due to incorrect boundary conditions in the Telemetry component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","score":8.6},"cwes":["CWE-754","CWE-120","CWE-501"],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=2016368","https://www.mozilla.org/security/advisories/mfsa2026-20/","https://www.mozilla.org/security/advisories/mfsa2026-21/","https://www.mozilla.org/security/advisories/mfsa2026-22/","https://www.mozilla.org/security/advisories/mfsa2026-23/"],"products":["mozilla:firefox"],"source":"nvd","synced_at":"2026-10-19T22:26:19.218427112+00:00"},"epss":{"cve":"CVE-2026-4687","score":0.0056,"percentile":0.466,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}