CVE-2017-7844
This can allow a malicious website to query user history.
Does this matter?
Lower severity and a low EPSS score (1.72%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.0
- 6.5 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
- EPSS
- 1.72% probability · 77th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-200
- Affected
- mozilla/firefox
- Source
- security@mozilla.org
EPSS 1.7% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/102039Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039954Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1420001Issue Tracking, Permissions Required, Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-27/Vendor Advisory
- http://www.securityfocus.com/bid/102039Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1039954Third Party Advisory, VDB Entry
- https://bugzilla.mozilla.org/show_bug.cgi?id=1420001Issue Tracking, Permissions Required, Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2017-27/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.