CVE-2026-28403

Name: CVE-2026-28403
Creator: NVD / NIST
Published: 2026-03-02T16:16:25.75+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.6/10EPSS 0.14%

Last modified Jun 17, 2026

CVE-2026-28403 is a high-severity vulnerability rated 7.6/10 on the CVSS scale. 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. EPSS estimates a 0.14% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.6/10

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

EPSS Probability

0.14%

3.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-346

Affected Software

Vendor	Product	Versions
Fka	Textream	< 1.5.1

References

https://github.com/f/textream/commit/f5ebad82750b9313386c34af8f0ede50c213a8a0Patch
https://github.com/f/textream/security/advisories/GHSA-wr3v-x247-337wExploit, Mitigation, Vendor Advisory

Timeline

Published: Mar 2, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-28403?

How severe is CVE-2026-28403?

CVE-2026-28403 has a CVSS score of 7.6/10 (HIGH severity). The EPSS model estimates a 0.14% probability of exploitation in the next 30 days.

How do I fix CVE-2026-28403?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-28403?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST