What’s Vulnerable › Vulnerabilities

CVE-2025-8533: Incorrect Authorization of XPC Service in Fantastical.app

• Severity: medium (CVSS 6.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-08-07 · updated 2026-06-17
• Weakness: CWE-863

Description

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.

Affected products

• Flexibits Fantastical: before 4.0.16 — fixed in 4.0.16

How to fix

Upgrade to a fixed version: Flexibits Fantastical 4.0.16. Check the vendor advisory for mitigations.

References

• https://cert.pl/en/posts/2025/08/CVE-2025-8533
• https://flexibits.com/fantastical

Get alerted when CVE-2025-8533 or the next vulnerability affects your stack