{"cve":"CVE-2023-4053","nvd":{"published":"2023-08-01T15:15:10.267","modified":"2026-06-17T06:36:59.850","status":"Modified","description":"A website could have obscured the full screen notification by using a URL with a scheme handled by an external program, such as a mailto URL. This could have led to user confusion and possible spoofing attacks. This vulnerability affects Firefox < 116, Firefox ESR < 115.2, and Thunderbird < 115.2.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N","score":6.5},"cwes":["CWE-59"],"references":["https://bugzilla.mozilla.org/show_bug.cgi?id=1839079","https://www.mozilla.org/security/advisories/mfsa2023-29/","https://www.mozilla.org/security/advisories/mfsa2023-36/","https://www.mozilla.org/security/advisories/mfsa2023-38/","https://bugzilla.mozilla.org/show_bug.cgi?id=1839079"],"products":["mozilla:firefox"],"source":"nvd","synced_at":"2026-10-19T21:38:35.729974749+00:00"},"epss":{"cve":"CVE-2023-4053","score":0.00768,"percentile":0.5556,"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."]}