Medium 6.5Published Jul 21, 2026

CVE-2026-16403Spoofing issue in the Address Bar component.

Updated under an hour ago (2026-10-19 10:10 UTC)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

Spoofing issue in the Address Bar component. This vulnerability was fixed in Firefox 153 and Thunderbird 153.

CVSS: 6.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-451
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jul 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

mozilla firefox mozilla:firefox	before 153.0.0	NVD
mozilla thunderbird mozilla:thunderbird	before 153.0	NVD

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1972244permissions-required
https://www.mozilla.org/security/advisories/mfsa2026-68/vendor-advisory
https://www.mozilla.org/security/advisories/mfsa2026-71/vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.