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6.5 Medium

CVE-2025-5271 Previewing a response in Devtools ignored CSP headers, which could have allowed content injection attacks

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.

Affected products and versions

Product Affected versions Fixed in
Firefox 139 earliest → < 139 139
Thunderbird 139 earliest → < 139 139

Other CVEs of Firefox

The 2221 CVEs of Firefox →
CVE-2026-120572 Incorrect boundary conditions in the Layout: Block and Inline component 8.8 High CVE-2026-118027 Frame poisoning in the Layout component 9.1 Critical CVE-2026-118024 Use-after-free in the Graphics: Text component 8.8 High CVE-2026-118025 Other issue in the SVG component 8.8 High
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