CVE-2026-16477Insecure Deserialization of .cleanshot Files in CleanShot X
Updated under an hour ago ()
Does this affect you?
It affects MTW CleanShot X. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.29%, higher than 21% of scored CVEs.
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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
- CVSS
- 8.4 HIGH (v4.0, CNA)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
- Weakness (CWE)
- CWE-502
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.29% (percentile 21)
- Assigned by
- CERT-PL
- NVD analysis
- Awaiting Analysis
- Record last updated
- Oct 22, 2026
- First seen by InfoSec Signals
- Oct 22, 2026
Affected products
MTW CleanShot X mtw:cleanshot_x (from the name) | from 4.0.0 before 4.5.2; from 4.6.0 before 4.6.3; from 4.7.0 before 4.7.8; from 4.8.0 before 4.8.10 | CNA record |
References
- https://cert.pl/en/posts/2026/10/CVE-2026-16477third-party-advisory
- https://cleanshot.com/product
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.