CVE-2017-7797: Mozilla Firefox

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

Response header name interning does not have same-origin protections and these headers are stored in a global registry. This allows stored header names to be available cross-origin. This vulnerability affects Firefox < 55.

Affected products

• Mozilla Firefox: before 55.0 (fixed in 55.0)

Published 2018-06-11. Last modified 2026-06-17.