CVE-2017-7844: Mozilla Firefox

Medium severity, CVSS 6.5. EPSS: 1.8% chance of exploitation in the next 30 days.

A combination of an external SVG image referenced on a page and the coloring of anchor links stored within this image can be used to determine which pages a user has in their history. This can allow a malicious website to query user history. Note: This issue only affects Firefox 57. Earlier releases are not affected. This vulnerability affects Firefox < 57.0.1.

Affected products

• Mozilla Firefox: before 57.0.1 (fixed in 57.0.1)

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