CVE-2018-5117
Mozilla: URL spoofing with right-to-left text aligned left-to-right (MFSA 2018-03)
Severity
ModerateRed Hat Product Security
CVSS 3.0
Review impact separately from score.
Published · January 23, 2018
Updated · November 26, 2025
Description
If right-to-left text is used in the addressbar with left-to-right alignment, it is possible in some circumstances to scroll this text to spoof the displayed URL. This issue could result in the wrong URL being displayed as a location, which can mislead users to believe they are on a different site than the one loaded. This vulnerability affects Thunderbird < 52.6, Firefox ESR < 52.6, and Firefox < 58.
CVSS score applicability
The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.
Mitigation
No mitigation is specified in collected source.
CVSS / CWE
CVSS 3.0 · 6.1CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
CWE-451 · User Interface (UI) Misrepresentation of Critical Information