CVE-2025-8533 Incorrect Authorization of XPC Service in Fantastical.app
Local attackers can access Fantastical XPC services due to missing authorization checks, potentially reading or modifying calendar data.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-8533?
CVE-2025-8533 is a medium-severity missing authorization vulnerability in Flexibits Fantastical, published on 7 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-863
Which versions are affected by CVE-2025-8533?
How do I fix CVE-2025-8533?
No fix has been published for CVE-2025-8533 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2025-8533 being exploited?
There is no known exploitation of CVE-2025-8533 in the wild and no public exploit code.
Sources
Also known as GHSA-8g5c-fvxq-mw4m.