CVE-2019-11712

Mozilla: Cross-origin POST requests can be made with NPAPI plugins by following 308 redirects

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Severity

Important

Red Hat Product Security

8.8

CVSS 3.0

Review impact separately from score.

Published · July 10, 2019

Updated · November 26, 2025

Description

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.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.0 · 8.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

CWE-829 · Inclusion of Functionality from Untrusted Control Sphere