Textream before 1.5.1 lacks Origin checks on its local WebSocket server
CVE-2026-28403 is rated CVSS 7.6 for cross-site WebSocket hijacking; both issues were fixed in 1.5.1.
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CVE-2026-28403
- CVSS 3.1
- 7.6 high
- EPSS
- <1%p6
- Published
- ·
- Modified
Description · NVD
Textream is a free macOS teleprompter app. Prior to version 1.5.1, the `DirectorServer` WebSocket server (`ws://127.0.0.1: `) 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.