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Sandboxie-Plus CVE-2026-34458

| EUVD-2026-27456 CRITICAL
Improper Neutralization of CRLF Sequences ('CRLF Injection') (CWE-93)
2026-05-05 GitHub_M
Privilege Escalation Microsoft
9.3
CVSS 4.0
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CVSS VectorNVD

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

Lifecycle Timeline

4
Patch available
May 05, 2026 - 21:02 EUVD
Source Code Evidence Fetched
May 05, 2026 - 20:30 vuln.today
Analysis Generated
May 05, 2026 - 20:30 vuln.today
CVSS changed
May 05, 2026 - 20:22 NVD
9.3 (CRITICAL)

DescriptionNVD

Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, an INI injection vulnerability allows any standard local user to bypass configuration restrictions (EditAdminOnly and ConfigPassword) and inject arbitrary directives into the global Sandboxie.ini configuration file. The background service skips authorization checks for IPC messages targeting sections beginning with UserSettings_, but does not sanitize CRLF characters in either the value parameter (via MSGID_SBIE_INI_ADD_SETTING) or the setting name parameter (via MSGID_SBIE_INI_SET_SETTING). An attacker can inject a new sandbox section header with unrestricted permissions, enabling sandbox escape and SYSTEM privilege escalation. This issue has been fixed in version 1.17.3.

AnalysisAI

INI injection in Sandboxie-Plus versions 1.17.2 and earlier enables any local low-privilege user to bypass EditAdminOnly and ConfigPassword protections, inject malicious directives into the global Sandboxie.ini file, create unrestricted sandbox sections, and escalate to SYSTEM privileges. The background service fails to authorize IPC messages for UserSettings_* sections and does not sanitize CRLF characters in MSGID_SBIE_INI_ADD_SETTING and MSGID_SBIE_INI_SET_SETTING parameters, allowing section header injection. …

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RemediationAI

Within 24 hours: Identify all systems running Sandboxie-Plus 1.17.2 or earlier via endpoint inventory. Within 7 days: Upgrade all affected instances to Sandboxie-Plus version 1.17.3 or later; restrict local user access to machines running vulnerable versions where immediate patching is not feasible. …

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CVE-2026-34458 vulnerability details – vuln.today
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