CVE-2026-49864
Severity CVSS v4.0:
HIGH
Type:
CWE-79
Cross-Site Scripting (XSS)
Publication date:
13/08/2026
Last modified:
18/08/2026
Description
wetty provides terminal access in browser over http/https. Prior to version 3.0.4, the wetty client decodes a base64 filename from the file-download escape sequence and interpolates it raw into a Toastify HTML string (`escapeMarkup: false`). Any output the victim renders - a `cat`'d file, a tailed log, an SSH MOTD, a `curl` response - that contains `\x1b[5i...:...\x1b[4i` runs script in the wetty origin and types attacker-chosen keystrokes into the victim's SSH session. Version 3.0.4 fixes the issue.
Impact
Base Score 4.0
8.60
Severity 4.0
HIGH