CVE-2026-28403 — HIGH (7.6)

Vulnerability 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.

CVSS Score

7.6

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

LOW

Integrity

HIGH

Availability

LOW

Affected Products

Vendor	Product	Versions
Fka	Textream	< 1.5.1

Related Weaknesses (CWE)

CWE-346

References

https://github.com/f/textream/commit/f5ebad82750b9313386c34af8f0ede50c213a8a0Patch
https://github.com/f/textream/security/advisories/GHSA-wr3v-x247-337wExploitMitigationVendor Advisory

FAQ

What is CVE-2026-28403?

CVE-2026-28403 is a vulnerability with a CVSS score of 7.6 (HIGH). 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...

How severe is CVE-2026-28403?

CVE-2026-28403 has been rated HIGH with a CVSS base score of 7.6/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-28403?

Check the references section above for vendor advisories and patch information. Affected products include: Fka Textream.