CVE-2025-3029

firefox: thunderbird: URL Bar Spoofing via non-BMP Unicode characters

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Severity

Moderate

Red Hat Product Security

5.4

CVSS 3.1

Review impact separately from score.

Published · April 1, 2025

Updated · June 28, 2026

Description

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: A crafted URL containing specific Unicode characters could have hidden the true origin of the page, resulting in a potential spoofing attack.

Statement

Red Hat Product Security rates the severity of this flaw as determined by the Mozilla Foundation Security Advisory.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 5.4
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

CWE-346 · Origin Validation Error