Description
Open Whisper Signal (aka Signal-Desktop) through 1.23.1 and the Signal Private Messenger application through 4.35.3 for Android are vulnerable to an IDN homograph attack when displaying messages containing URLs. This occurs because the application produces a clickable link even if (for example) Latin and Cyrillic characters exist in the same domain name, and the available font has an identical representation of characters from different alphabets.
References (2)
Core 2
Core References
Third Party Advisory, VDB Entry vdb-entry
x_refsource_bid
http://www.securityfocus.com/bid/107550
Third Party Advisory x_refsource_misc
https://github.com/blazeinfosec/advisories/blob/master/signal-advisory.txt
Scores
CVSS v3
6.5
EPSS
0.0042
EPSS Percentile
62.2%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Details
Status
published
Products (2)
signal/private_messenger
< 4.35.3
signal/signal-desktop
< 1.23.1
Published
Mar 24, 2019
Tracked Since
Feb 18, 2026