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CVE-2026-34596

Sandboxie-plus Sandboxie vulnerability

7.0 HIGHPublic exploitEPSS 0.11%
  1. Published5 May 2026

Description

Sandboxie-Plus is an open source sandbox-based isolation software for Windows. In versions 1.17.2 and earlier, a Time-of-Check-to-Time-of-Use (TOCTOU) race condition exists during addon installation. When a user installs an addon through the SandMan interface, UpdUtil.exe is spawned as SYSTEM by SbieSvc but stages files in the user-writable %TEMP%\sandboxie-updater directory. After UpdUtil verifies file hashes against the signed addon manifest, install.bat extracts files.cab and executes config.exe from its contents. Between hash verification and extraction, an unprivileged user can replace files.cab with a crafted cabinet containing a malicious executable, which is then run as SYSTEM. No UAC prompt is required. This issue has been fixed in version 1.17.3.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityHigh
Privileges requiredLow
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/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-2026-34596 being actively exploited?

CVE-2026-34596 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.11%.

How severe is CVE-2026-34596?

CVE-2026-34596 has a CVSS 3.1 base score of 7.0, rated high. EPSS estimates a 0.11% probability of exploitation.

Which products are affected by CVE-2026-34596?

Affected products include Sandboxie-plus Sandboxie.

How do I fix CVE-2026-34596?

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-2026-34596 against the real software inventory on every managed device, every day. 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.