Vulnerability in F Textream
CVE-2026-28403
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L.
EPSS exploit prediction
EPSS: 0.002 (6.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.002 · change: +0.000
Affected products
- F Textream — versions < 1.5.1
- Fka Textream
Weakness classification (CWE)
References
- github.com/f/textream/security/advisories/GHSA-wr3v-x247-337w (Exploit, Mitigation, Vendor Advisory)
- github.com/f/textream/commit/f5ebad82750b9313386c34af8f0ede50c213a8a0 (Patch)
Frequently asked questions
- What is CVE-2026-28403?
- CVE-2026-28403 is a high-severity vulnerability in F Textream, classified under Origin Validation Error. CVSS score: 7.6/10. Published 2026-03-02.
- How severe is CVE-2026-28403?
- High severity. CVSS v3 base score is 7.6 out of 10.