MTW CleanShot X up to 4.5.1/4.6.2/4.7.7/4.8.9 deserialization

Summaryinfo

A vulnerability labeled as critical has been found in MTW CleanShot X up to 4.5.1/4.6.2/4.7.7/4.8.9. Affected by this issue is some unknown functionality. The manipulation results in deserialization. This vulnerability is identified as CVE-2026-16477. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, was found in MTW CleanShot X up to 4.5.1/4.6.2/4.7.7/4.8.9. Affected is an unknown part. The manipulation with an unknown input leads to a deserialization vulnerability. CWE is classifying the issue as CWE-502. The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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

The advisory is shared for download at cert.pl. This vulnerability is traded as CVE-2026-16477 since 07/21/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 4.5.2, 4.6.3, 4.7.8 or 4.8.10 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• MTW

Name

• CleanShot X

Version

• 4.5.0
• 4.5.1
• 4.6.0
• 4.6.1
• 4.6.2
• 4.7.0
• 4.7.1
• 4.7.2
• 4.7.3
• 4.7.4
• 4.7.5
• 4.7.6
• 4.7.7
• 4.8.0
• 4.8.1
• 4.8.2
• 4.8.3
• 4.8.4
• 4.8.5
• 4.8.6
• 4.8.7
• 4.8.8
• 4.8.9

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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