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Vulnerability record · CVE-2026-28403 · published 2 March 2026

CVE-2026-28403: Fka textream origin validation error vulnerability

Fka · Textream

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.

7.6 CVSS 3.1 High EPSS 0.17% · top 94.2% CWE-346 · Origin validation error
7.6CVSS 3.1 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
2References, 1 tagged exploit
17 Jun 2026Last modified by NVD

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/f/textream/commit/f5ebad82750b9313386c34af8f0ede50c213a8a0 Patch
https://github.com/f/textream/security/advisories/GHSA-wr3v-x247-337w ExploitMitigationVendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.5CVE-2026-28412Fka textream uncontrolled resource consumption vulnerabilityTextream is a free macOS teleprompter app. Prior to version 1.5.1, the `DirectorServer` WebSocket server imposes no limit on concurrent connections. …EPSS 0.39%9.4CVE-2025-34291Langflow CORS misconfiguration leads to token theft and RCELangflow up to and including 1.6.9 ships an overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) and a refresh token …KEVEPSS 93%analysed8.8CVE-2015-4495Firefox PDF reader same-origin bypass allows file read and privilege gainThe PDF reader in Mozilla Firefox (before 39.0.3), Firefox ESR 38.x (before 38.1.1), and Firefox OS (before 2.2) fails to properly validate origin, l…KEVEPSS 69%analysed

Source: NIST National Vulnerability Database (record CVE-2026-28403), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.