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Vulnerability in Flexibits Fantastical software
07 August 2025 | CERT Polska | #vulnerability, #warning, #cve
CVE ID CVE-2025-8533
Publication date 07 August 2025
Vendor Flexibits
Product Fantastical
Vulnerable versions All before 4.0.16
Vulnerability type (CWE) Incorrect Authorization (CWE-863)
Report source Report to CERT Polska

Description

CERT Polska has received a report about vulnerability in Flexibits Fantastical software and participated in coordination of its disclosure.

The vulnerability CVE-2025-8533: A vulnerability was identified in the XPC services of Fantastical. The services failed to implement proper client authorization checks in its listener:shouldAcceptNewConnection method, unconditionally accepting requests from any local process. As a result, any local, unprivileged process could connect to the XPC service and access its methods.

This issue has been resolved in version 4.0.16.

Credits

We thank Karol Mazurek and Sławomir Zakrzewski from Afine Team for the responsible vulnerability report.

More about the coordinated vulnerability disclosure process at CERT Polska can be found at https://cert.pl/en/cvd/.