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CVE-2026-34458

Sandboxie-plus Sandboxie privilege escalation

8.8 HIGHPublic exploitEPSS 0.29%
  1. Published5 May 2026

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 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected products

Sandboxie-plus Sandboxie< 1.17.3

Remediation

Fixed in
Sandboxie-plus Sandboxie≥ 1.17.3

References

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Frequently asked

Is CVE-2026-34458 being actively exploited?

CVE-2026-34458 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.29%.

How severe is CVE-2026-34458?

CVE-2026-34458 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 0.29% probability of exploitation.

Which products are affected by CVE-2026-34458?

Affected products include Sandboxie-plus Sandboxie.

How do I fix CVE-2026-34458?

Upgrade affected software to a fixed version, for example Sandboxie-plus Sandboxie 1.17.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-34458 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.