CVE-2025-5271 describes a medium-severity vulnerability in Firefox and Thunderbird versions prior to 139, where the Devtools preview function failed to enforce Content Security Policy (CSP) headers, enabling potential content injection attacks. With a CVSS score of 6.5, this flaw could allow an unauthenticated attacker to achieve partial confidentiality and integrity impacts with low attack complexity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 139.0CPE matchmatch criteria | cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
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The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.