{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-16477", "assignerOrgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "state": "PUBLISHED", "assignerShortName": "CERT-PL", "dateReserved": "2026-07-21T14:22:56.242Z", "datePublished": "2026-10-22T14:47:26.652Z", "dateUpdated": "2026-10-22T14:47:26.652Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6", "shortName": "CERT-PL", "dateUpdated": "2026-10-22T14:47:26.652Z"}, "title": "Insecure Deserialization of .cleanshot Files in CleanShot X", "datePublic": "2026-07-21T12:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-502", "description": "CWE-502: Deserialization of Untrusted Data", "type": "CWE"}]}], "affected": [{"vendor": "MTW", "product": "CleanShot X", "platforms": ["MacOS"], "versions": [{"status": "affected", "version": "4.0.0", "lessThan": "4.5.2", "versionType": "semver"}, {"status": "affected", "version": "4.6.0", "lessThan": "4.6.3", "versionType": "semver"}, {"status": "affected", "version": "4.7.0", "lessThan": "4.7.8", "versionType": "semver"}, {"status": "affected", "version": "4.8.0", "lessThan": "4.8.10", "versionType": "semver"}], "defaultStatus": "unaffected"}], "cpeApplicability": [{"operator": "OR", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:mtw:cleanshot_x:*:*:macos:*:*:*:*:*", "versionStartIncluding": "4.0.0", "versionEndExcluding": "4.5.2"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mtw:cleanshot_x:*:*:macos:*:*:*:*:*", "versionStartIncluding": "4.6.0", "versionEndExcluding": "4.6.3"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mtw:cleanshot_x:*:*:macos:*:*:*:*:*", "versionStartIncluding": "4.7.0", "versionEndExcluding": "4.7.8"}, {"vulnerable": true, "criteria": "cpe:2.3:a:mtw:cleanshot_x:*:*:macos:*:*:*:*:*", "versionStartIncluding": "4.8.0", "versionEndExcluding": "4.8.10"}]}]}], "descriptions": [{"lang": "en", "value": "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:\u00a04.5.2,\u00a04.6.3,\u00a04.7.8 and\u00a04.8.10", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<p>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:&nbsp;4.5.2,&nbsp;4.6.3,&nbsp;4.7.8 and&nbsp;4.8.10</p>"}]}], "references": [{"url": "https://cert.pl/en/posts/2026/10/CVE-2026-16477", "tags": ["third-party-advisory"]}, {"url": "https://cleanshot.com/", "tags": ["product"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "ACTIVE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "LOW", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "LOW", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "LOW", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.4, "vectorString": "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"}}], "credits": [{"lang": "en", "value": "Dharan24", "type": "finder"}], "source": {"discovery": "EXTERNAL"}, "x_generator": {"engine": "Vulnogram 1.0.3"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "platforms": ["MacOS"], "product": "CleanShot X", "vendor": "MTW", "versions": [{"lessThan": "4.5.2", "status": "affected", "version": "4.0.0", "versionType": "semver"}, {"lessThan": "4.6.3", "status": "affected", "version": "4.6.0", "versionType": "semver"}, {"lessThan": "4.7.8", "status": "affected", "version": "4.7.0", "versionType": "semver"}, {"lessThan": "4.8.10", "status": "affected", "version": "4.8.0", "versionType": "semver"}]}], "source": "cvd@cert.pl"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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:\u00a04.5.2,\u00a04.6.3,\u00a04.7.8 and\u00a04.8.10"}], "id": "CVE-2026-16477", "lastModified": "2026-10-22T15:17:05.817", "metrics": {"cvssMetricV40": [{"cvssData": {"Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "Safety": "NOT_DEFINED", "attackComplexity": "LOW", "attackRequirements": "NONE", "attackVector": "LOCAL", "availabilityRequirement": "NOT_DEFINED", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityRequirement": "NOT_DEFINED", "exploitMaturity": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "privilegesRequired": "NONE", "providerUrgency": "NOT_DEFINED", "subAvailabilityImpact": "LOW", "subConfidentialityImpact": "LOW", "subIntegrityImpact": "LOW", "userInteraction": "ACTIVE", "valueDensity": "NOT_DEFINED", "vectorString": "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", "version": "4.0", "vulnAvailabilityImpact": "HIGH", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnerabilityResponseEffort": "NOT_DEFINED"}, "source": "cvd@cert.pl", "type": "Secondary"}]}, "published": "2026-10-22T15:17:05.817", "references": [{"source": "cvd@cert.pl", "url": "https://cert.pl/en/posts/2026/10/CVE-2026-16477"}, {"source": "cvd@cert.pl", "url": "https://cleanshot.com/"}], "sourceIdentifier": "cvd@cert.pl", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-502"}], "source": "cvd@cert.pl", "type": "Primary"}]}

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