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Vulnerability details

CVE-2026-34458

sandboxie-plus Sandboxie

Sandboxie-Plus privilege escalation via INI CRLF injection bypassing EditAdminOnly

CVSS 4.0
9.3Critical

Official description

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.

CVSS scores

ScoreVersionSourceVector
9.3Critical 4.0 CVEProject cvelistV5 (CNA) (GitHub_M) 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

Affected products

VendorProductVersionsSource
sandboxie-plus Sandboxie < 1.17.3 CVEProject cvelistV5 (CNA)

References and advisories

2
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Details

Published
2026-05-05
Last updated
2026-05-07
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.25%
Probability of exploitation in 30 days
16.5%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
Proof of concept
Technical impact
Total

Weaknesses (CWE)

  • CWE-93
    Improper Neutralization of CRLF Sequences ('CRLF Injection')