CVE-2026-16477

What it is

CleanShot X for macOS insecurely deserializes untrusted data embedded in a .cleanshot project file (editable screenshot annotations). Exploitation requires an attacker to craft a malicious .cleanshot file, deliver it to the target, and have the target open it; the payload then executes automatically during parsing, resulting in arbitrary code execution in the context of the current user. Users who have never opened a .cleanshot file from an untrusted source are not affected by this vulnerability. This vulnerability was fixed in versions: 4.5.2, 4.6.3, 4.7.8 and 4.8.10

At a glance

Exploitability

Can be exploited locally on the machine without logging in, but needs a user to act. High risk of data exposure, data tampering, service disruption.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-10-22 15:17 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-22 19:17 UTC Last updatedMost recent change to the record

Details

Published

2026-10-22 15:17 UTC

Last modified

2026-10-22 19:17 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-502 · Unsafe deserialization

Record status

Awaiting Analysis

Attack profile CVSS 4.0 · 8.4

Attack vector

Local

Complexity

Low

Attack requirements

None

Privileges needed

None

User interaction

Active

Confidentiality

High

Integrity

High

Availability

High