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CVE-2025-5271: Previewing a response in Devtools ignored CSP headers, which could have allowed content injection attacks. This vulnerability affects Firefox < 139.
Description
Previewing a response in Devtools ignored CSP headers, which could have allowed content injection attacks. This vulnerability affects Firefox < 139.
Classification
CVE ID: CVE-2025-5271
Problem Types
Devtools' preview ignored CSP headersAffected Products
Vendor: Mozilla
Product: Firefox
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.05% (probability of being exploited)
EPSS Percentile: 15.67% (scored less or equal to compared to others)
EPSS Date: 2025-06-19 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-5271https://bugzilla.mozilla.org/show_bug.cgi?id=1920348
https://www.mozilla.org/security/advisories/mfsa2025-42/