{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-107615", "assignerOrgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "state": "PUBLISHED", "assignerShortName": "securin", "dateReserved": "2026-10-08T13:23:07.677Z", "datePublished": "2026-10-08T13:39:59.358Z", "dateUpdated": "2026-10-08T14:00:27.042Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "33c584b5-0579-4c06-b2a0-8d8329fcab9c", "shortName": "securin", "dateUpdated": "2026-10-08T13:39:59.358Z"}, "title": "DLL search order hijacking via screenhooks libraries in TightVNC Server", "descriptions": [{"lang": "en", "value": "An uncontrolled search path element vulnerability in GlavSoft TightVNC Server for Windows before 2.8.88 allows a local authenticated user to execute arbitrary code with SYSTEM privileges. DynamicLibrary::init() (and ThemeLib) load screenhooks32.dll / screenhooks64.dll with LoadLibrary() using a bare file name and no LOAD_LIBRARY_SEARCH_* flags, so the TightVNC service follows the default DLL search order and loads an attacker-planted DLL from a writable directory earlier in that order (for example, an installation directory with permissive ACLs)."}], "affected": [{"vendor": "GlavSoft", "product": "TightVNC", "platforms": ["Windows"], "modules": ["TightVNC Server (screen hooks loader)"], "programFiles": ["DynamicLibrary.cpp", "ThemeLib.cpp"], "programRoutines": [{"name": "DynamicLibrary::init()"}], "defaultStatus": "unaffected", "versions": [{"version": "0", "lessThan": "2.8.88", "status": "affected", "versionType": "custom"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-427", "description": "CWE-427 Uncontrolled Search Path Element"}]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}}], "solutions": [{"lang": "en", "value": "Upgrade TightVNC for Windows to version 2.8.88 or later."}], "references": [{"url": "https://sourceforge.net/p/vnc-tight/bugs/1666/", "name": "TightVNC bug #1666", "tags": ["issue-tracking"]}, {"url": "https://www.tightvnc.com/whatsnew.php", "name": "TightVNC release notes (2.8.88)", "tags": ["release-notes", "patch"]}], "credits": [{"lang": "en", "type": "finder", "value": "Arjun Basnet from Securin"}], "timeline": [{"time": "2026-05-30T00:00:00.000Z", "lang": "en", "value": "Reported to GlavSoft"}, {"time": "2026-06-02T00:00:00.000Z", "lang": "en", "value": "Vendor acknowledged"}, {"time": "2026-06-19T00:00:00.000Z", "lang": "en", "value": "TightVNC 2.8.88 released with fix"}], "source": {"discovery": "EXTERNAL"}, "impacts": [{"capecId": "CAPEC-471", "descriptions": [{"lang": "en", "value": "CAPEC-471 Search Order Hijacking"}]}], "workarounds": [{"lang": "en", "value": "Ensure the TightVNC installation directory and every directory on the system PATH are writable only by administrators."}]}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-10-08T14:00:03.531511Z", "id": "CVE-2026-107615", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-08T14:00:27.042Z"}}]}}

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