CVE-2019-11712: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 1% chance of exploitation in the next 30 days.

POST requests made by NPAPI plugins, such as Flash, that receive a status 308 redirect response can bypass CORS requirements. This can allow an attacker to perform Cross-Site Request Forgery (CSRF) attacks. This vulnerability affects Firefox ESR < 60.8, Firefox < 68, and Thunderbird < 60.8.

Affected products

• Mozilla Firefox: before 60.8.0 (fixed in 60.8.0); before 68.0 (fixed in 68.0)
• Mozilla Thunderbird: before 60.8.0 (fixed in 60.8.0)

Published 2019-07-23. Last modified 2026-06-17.