Full Report
Incorrect Authorization vulnerability (CVE-2025-8533) has been found in Flexibits Fantastical software.
Analysis Summary
# Vulnerability: Incorrect Authorization in Flexibits Fantastical XPC Services
## CVE Details
- CVE ID: CVE-2025-8533
- CVSS Score: Information Not Provided ([Not Available])
- CWE: CWE-863 (Incorrect Authorization)
## Affected Systems
- Products: Flexibits Fantastical
- Versions: All versions before 4.0.16
- Configurations: Any local configuration where the application is running.
## Vulnerability Description
A vulnerability exists in the XPC services of the Flexibits Fantastical application due to a failure to implement proper client authorization checks within the `listener:shouldAcceptNewConnection` method. This flaw results in the XPC service unconditionally accepting connection requests from any local process, allowing any local, unprivileged process to connect to the service and invoke its methods.
## Exploitation
- Status: Information Not Provided (Assumed Not Exploited in the Wild without further data)
- Complexity: Information Not Provided (Likely Low, as it only requires local process execution)
- Attack Vector: Local
## Impact
- Confidentiality: Information Not Provided (Potentially High, pending knowledge of accessible methods)
- Integrity: Information Not Provided (Potentially High, pending knowledge of accessible methods)
- Availability: Information Not Provided
## Remediation
### Patches
- Version 4.0.16 (or newer) resolves the vulnerability by properly implementing client authorization checks.
### Workarounds
- No specific workarounds were provided in the advisory. Restricting the execution environment might be a temporary measure, but patching is the definitive fix.
## Detection
- Since this vulnerability requires a local process to interact with an XPC service, detection would focus on unexpected inbound connections or method calls against the Fantastical XPC service endpoint by unauthorized local processes.
- No specific Indicators of Compromise (IOCs) were provided.
## References
- Vendor Advisory: Flexibits (Implied via coordinated disclosure)
- Relevant links - defanged: hxxps://cert.pl/en/news/2025/08/vulnerability-in-flexibits-fantastical-software