CVE-2026-34527

Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, SbieIniServer::HashPassword converts a SHA-1 digest to hexadecimal incorrectly. The high nibble of each byte is shifted right by 8 instead of 4, which always produces zero for an 8-bit value. As a result, the stored EditPassword hash only preserves the low nibble of each digest byte, reducing the effective entropy from 160 bits to 80 bits. This is layered on top of an unsalted SHA-1 scheme. The reduced entropy makes leaked or backed-up password hashes materially easier to brute-force. This issue has been fixed in version 1.17.3.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w37h-qm9p-h4x2	Mitigation Vendor Advisory
https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-w37h-qm9p-h4x2	Mitigation Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:sandboxie-plus:sandboxie:*:*:*:*:plus:*:*:*

History

No history.

Information

Published : 2026-05-05 20:16

Updated : 2026-07-24 22:10

NVD link : CVE-2026-34527

Mitre link : CVE-2026-34527

CVE.ORG link : CVE-2026-34527

JSON object : View

Products Affected

sandboxie-plus

sandboxie

CWE

CWE-328

Use of Weak Hash

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In versions 1.17.2 and earlier, SbieIniServer::HashPassword converts a SHA-1 digest to hexadecimal incorrectly. The high nibble of each byte is shifted right by 8 instead of 4, which always produces zero for an 8-bit value. As a result, the stored EditPassword hash only preserves the low nibble of each digest byte, reducing the effective entropy from 160 bits to 80 bits. This is layered on top of an unsalted SHA-1 scheme. The reduced entropy makes leaked or backed-up password hashes materially easier to brute-force.\n\nThis issue has been fixed in version 1.17.3."}, {"lang": "es", "value": "Sandboxie-Plus es un software de aislamiento de c\u00f3digo abierto basado en sandbox para Windows. En las versiones 1.17.2 y anteriores, SbieIniServer::HashPassword convierte un resumen SHA-1 a hexadecimal incorrectamente. El nibble superior de cada byte se desplaza a la derecha 8 bits en lugar de 4, lo que siempre produce cero para un valor de 8 bits. Como resultado, el hash de EditPassword almacenado solo conserva el nibble inferior de cada byte del resumen, reduciendo la entrop\u00eda efectiva de 160 bits a 80 bits. Esto se superpone a un esquema SHA-1 sin sal. La entrop\u00eda reducida hace que los hashes de contrase\u00f1as filtrados o respaldados sean materialmente m\u00e1s f\u00e1ciles de forzar por fuerza bruta.\n\nEste problema ha sido solucionado en la versi\u00f3n 1.17.3."}], "lastModified": "2026-07-24T22:10:00.140", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:sandboxie-plus:sandboxie:*:*:*:*:plus:*:*:*", "vulnerable": true, "matchCriteriaId": "69CB00B4-502D-4839-B404-93FA214C6978", "versionEndExcluding": "1.17.3"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}