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Vulnerability record · CVE-2023-6870 · published 19 December 2023

CVE-2023-6870: Mozilla firefox vulnerability

Mozilla · Firefox

Applications which spawn a Toast notification in a background thread may have obscured fullscreen notifications displayed by Firefox. *This issue only affects Android versions of Firefox and Firefox Focus.* This vulnerability affects Firefox < 121.

4.3 CVSS 3.1 Medium EPSS 0.38% · top 70.2%
4.3CVSS 3.1 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

Applications which spawn a Toast notification in a background thread may have obscured fullscreen notifications displayed by Firefox. *This issue only affects Android versions of Firefox and Firefox Focus.* This vulnerability affects Firefox < 121.

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.mozilla.org/show_bug.cgi?id=1823316 Issue TrackingPermissions Required
https://security.gentoo.org/glsa/202401-10 Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2023-56/ Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1823316 Issue TrackingPermissions Required
https://security.gentoo.org/glsa/202401-10 Third Party Advisory
https://www.mozilla.org/security/advisories/mfsa2023-56/ Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2023-6870), CISA KEV, FIRST EPSS (scores of 2026-09-29). This page is refreshed as NVD updates the record.