CVE-2019-12383

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 2.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-05-28 · updated 2026-06-17
Weakness: CWE-203

Description

Tor Browser before 8.0.1 has an information exposure vulnerability. It allows remote attackers to detect the browser's UI locale by measuring a button width, even if the user has a "Don't send my language" setting.

Affected products

torproject Tor Browser: before 8.0.1 — fixed in 8.0.1

How to fix

Upgrade to a fixed version: torproject Tor Browser 8.0.1. Check the vendor advisory for mitigations.

References

http://www.securityfocus.com/bid/108484
https://gitweb.torproject.org/tor-browser.git/commit/?id=cbb04b72c68272c2de42f157d40cd7d29a6b7b55
https://hackerone.com/reports/282748
https://trac.torproject.org/projects/tor/ticket/24056
http://www.securityfocus.com/bid/108484
https://gitweb.torproject.org/tor-browser.git/commit/?id=cbb04b72c68272c2de42f157d40cd7d29a6b7b55
https://hackerone.com/reports/282748
https://trac.torproject.org/projects/tor/ticket/24056

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