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High · 7.6 CVE-2026-28403 EUVD-2026-9200

Textream Cross-Site WebSocket Hijacking (CSWSH) vulnerability

Published Mar 2, 2026 · Updated Mar 2, 2026 · Assigned by GitHub_M

Description

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.

Affected products

VendorProductAffectedFixed
f textream < 1.5.1 —

References