CVE-2025-5271

6.5 MEDIUM

Published: May 27, 2025 Modified: April 13, 2026

Description

Previewing a response in Devtools ignored CSP headers, which could have allowed content injection attacks. This vulnerability was fixed in Firefox 139 and Thunderbird 139.

AI Explanation

Get an AI-powered plain-language explanation of this vulnerability and remediation steps.

CVSS v3.x Details

0.0 Low Medium High Critical 10.0

Vector String

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

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory

https://bugzilla.mozilla.org/show_bug.cgi?id=1920348

Source: security@mozilla.org

Permissions Required

https://www.mozilla.org/security/advisories/mfsa2025-42/

Source: security@mozilla.org

Vendor Advisory

https://www.mozilla.org/security/advisories/mfsa2025-45/

Source: security@mozilla.org

3 reference(s) from NVD

Quick Stats

CVSS v3 Score

6.5 / 10.0

EPSS (Exploit Probability)

0.3%

52th percentile

Exploitation Status

Not in CISA KEV

Weaknesses (CWE)

CWE-116

Affected Vendors

mozilla

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