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Sandboxie-Plus CVE-2026-34527

| EUVD-2026-27466 LOW
Use of Weak Hash (CWE-328)
2026-05-05 GitHub_M
Information Disclosure Microsoft
2.0
CVSS 4.0

CVSS VectorNVD

CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/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
Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

3
Patch available
May 05, 2026 - 21:02 EUVD
Analysis Generated
May 05, 2026 - 20:33 vuln.today
CVSS changed
May 05, 2026 - 20:22 NVD
2.0 (LOW)

DescriptionNVD

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.

AnalysisAI

Sandboxie-Plus versions 1.17.2 and earlier contain a cryptographic implementation flaw in SbieIniServer::HashPassword that reduces SHA-1 password hash entropy from 160 bits to 80 bits by incorrectly shifting the high nibble of each byte right by 8 instead of 4, combined with an unsalted hashing scheme. This makes leaked or backed-up EditPassword hashes significantly easier to brute-force, enabling attackers with local access and low privileges to recover plaintext passwords through offline attack. …

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CVE-2026-34527 vulnerability details – vuln.today
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