CVE-2026-28403 HIGH

CVE-2026-28403: Textream Cross-Site WebSocket Hijacking (CSWSH) vulnerability

Vendor F
Product textream
Weakness CWE-346 · Origin validation
Published March 2, 2026
Last update March 2, 2026
View on NVD All CVEs

CVSS base score

7.6/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction Required
Confidentiality Low
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L

What the vulnerability does

01Description

Textream is a free macOS teleprompter app. Prior to version 1.5.1, the `DirectorServer` WebSocket server (`ws://127.0.0.1:<httpPort+1>`) accepts connections from any origin without validating the HTTP `Origin` header during the WebSocket handshake. A malicious web page visited in the same browser session can silently connect to the local WebSocket server and send arbitrary `DirectorCommand` payloads, allowing full remote control of the teleprompter content. Version 1.5.1 fixes the issue.

Key dates

02Disclosure timeline

March 2, 2026 CVE published
March 2, 2026 Record updated