CVE-2016-9078: Mozilla Firefox

High severity, CVSS 8.8. EPSS: 1.9% chance of exploitation in the next 30 days.

Redirection from an HTTP connection to a "data:" URL assigns the referring site's origin to the "data:" URL in some circumstances. This can result in same-origin violations against a domain if it loads resources from malicious sites. Cross-origin setting of cookies has been demonstrated without the ability to read them. Note: This issue only affects Firefox 49 and 50. This vulnerability affects Firefox < 50.0.1.

Affected products

• Mozilla Firefox: version 49.0 only; version 50.0 only

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