---
title: "CVE-2026-16477: CleanShot X - Remote Code Execution"
description: "CleanShot X for macOS contains an insecure deserialization vulnerability caused by untrusted data in .cleanshot project files, letting attackers execute arbitrary code when a malicious file is opened by the user."
url: https://panop.io/threat-heartbeat/CVE-2026-16477/
---

# CVE-2026-16477 CleanShot X - Remote Code Execution

CleanShot X for macOS contains an insecure deserialization vulnerability caused by untrusted data in .cleanshot project files, letting attackers execute arbitrary code when a malicious file is opened by the user.

CVSS base score 8.4 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-16477)

## Details

Type

Remote Code Execution

Impact

Remote Code Execution

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Published

22 October 2026

Updated

23 October 2026

Weakness

[CWE-502](https://cwe.mitre.org/data/definitions/502.html)

## Vendor fix

Update to versions 4.5.2, 4.6.3, 4.7.8, or 4.8.10 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-16477](https://nvd.nist.gov/vuln/detail/CVE-2026-16477)
- [https://cert.pl/en/posts/2026/10/CVE-2026-16477](https://cert.pl/en/posts/2026/10/CVE-2026-16477)
- [https://cleanshot.com/](https://cleanshot.com/)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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