Arbitrary Code Execution Vulnerability in CleanShot X by Cleanshot
CVE-2026-16477

8.4HIGH

Key Information:

Vendor

Mtw

Status
Cleanshot X
Vendor
CVE Published:
22 October 2026

What is CVE-2026-16477?

CleanShot X for macOS contains a vulnerability that allows untrusted data deserialization. An attacker can create a malicious .cleanshot file and deliver it to a target user. If the user opens this file, the embedded payload executes automatically, leading to arbitrary code execution within the context of the user’s session. Users who have only interacted with .cleanshot files from trusted sources are unaffected. It's vital for users to update to the latest versions to mitigate this risk.

Affected Version(s)

CleanShot X MacOS 4.0.0 < 4.5.2

CleanShot X MacOS 4.6.0 < 4.6.3

CleanShot X MacOS 4.7.0 < 4.7.8

References

https://cert.pl/en/posts/2026/10/CVE-2026-16477
third-party-advisory
https://cleanshot.com/
product

CVSS V4

Score:
8.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Dharan24
.