CVE-2025-8533

Unauthorized XPC method access via unconditional connection acceptance

Published Aug 7, 2025 · Updated Aug 7, 2025

Incorrect authorization in Flexibits Fantastical before 4.0.16 allows local users to access methods exposed by its XPC services. The listener:shouldAcceptNewConnection method unconditionally accepts every local process instead of validating the XPC client's authorization. Any unprivileged local process can connect, but public sources do not identify the exposed methods or establish privilege escalation.

CVSS severity6.9
Medium
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Flexibits Fantastical before 4.0.16 allows local users to access methods exposed by its XPC services. The listener:shouldAcceptNewConnection method unconditionally accepts every local process instead of validating the XPC client's authorization. Any unprivileged local process can connect, but public sources do not identify the exposed methods or establish privilege escalation.

The record

CVE
CVE-2025-8533
Published
Aug 7, 2025
Updated
Aug 7, 2025
Vendor
Flexibits
Product
Fantastical
Classifications
CWE-863, T1559.003
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 7, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <4.0.16

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Flexibits · Fantasticalversion=0 <4.0.16

Published CVSS scores

6.9CERT PolskaCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1559.003Inter-Process Communication: XPC Services

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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