CVE-2025-6427

firefox: connect-src Content Security Policy restriction could be bypassed

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Severity

Moderate

Red Hat Product Security

6.1

CVSS 3.1

Review impact separately from score.

Published · June 24, 2025

Updated · June 30, 2026

Description

A flaw was found in Firefox. The Mozilla Foundation's Security Advisory describes the following issue: An attacker is able to bypass the <code>connect-src</code> directive of a Content Security Policy by manipulating subdocuments. This also hides the connections from the Network tab in Devtools.

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 · 6.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CWE not specified