How severe is CVE-2026-28403?

CVE-2026-28403 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability low.

Is CVE-2026-28403 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-28403?

CVE-2026-28403 affects Fka Textream. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-28403?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-28403 have an EU (EUVD) identifier?

Yes. CVE-2026-28403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9200.

When was CVE-2026-28403 published?

CVE-2026-28403 was published on 2026-03-02 and last updated on 2026-06-17.

CVE-2026-28403

CVE-2026-28403 is a high-severity vulnerability in Fka Textream with a CVSS 3.x base score of 7.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-346.

Key facts

Severity: High (CVSS 3.x base score 7.6)
EPSS exploit prediction: 0% (3rd percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9200
Weakness: CWE-346
Affected product: Fka Textream
Published: 2026-03-02
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-28403?: CVE-2026-28403 has a CVSS 3.x base score of 7.6, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity high, and availability low.
Is CVE-2026-28403 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (3rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-28403?: CVE-2026-28403 affects Fka Textream. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-28403?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-28403 have an EU (EUVD) identifier?: Yes. CVE-2026-28403 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9200.
When was CVE-2026-28403 published?: CVE-2026-28403 was published on 2026-03-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:fka:textream:*:*:*:*:*:*:*:*

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