macOS
CVE-2026-28403
HIGH
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:H/A:L
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
Textream prior to version 1.5.1 fails to validate the Origin header during WebSocket handshake, allowing malicious websites to establish unauthorized connections to the local DirectorServer and inject arbitrary commands. An attacker can exploit this from a browser to gain full remote control of teleprompter content without user interaction beyond visiting a compromised page. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Textream version prior to 1.5.1 running with DirectorServer WebSocket enabled on localhost; victim must visit attacker-controlled web page in same browser session where Textream is running. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 7.6 (HIGH). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A remote attacker could exploit this vulnerability to compromise the affected system. |
| Remediation | A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify and inventory all macOS systems running Textream versions prior to 1.5.1 and restrict network access to affected systems. …
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