CVE-2017-7844

Severity: medium (CVSS 6.5 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.7% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-06-11 · updated 2026-06-17
Weakness: CWE-200

Description

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

How to fix

Upgrade to a fixed version: Mozilla Firefox 57.0.1. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/102039
http://www.securitytracker.com/id/1039954
https://bugzilla.mozilla.org/show_bug.cgi?id=1420001
https://www.mozilla.org/security/advisories/mfsa2017-27/
http://www.securityfocus.com/bid/102039
http://www.securitytracker.com/id/1039954
https://bugzilla.mozilla.org/show_bug.cgi?id=1420001
https://www.mozilla.org/security/advisories/mfsa2017-27/

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