Is CVE-2026-34596 actively exploited?

No active exploitation of CVE-2026-34596 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-34596 be exploited remotely?

No. CVE-2026-34596 requires local access to exploit.

What is the CVSS score of CVE-2026-34596?

CVE-2026-34596 has a CVSS score of 7.0 (HIGH).

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HIGH

CVE-2026-34596

CWE-367Published: May 5, 2026· Updated: May 7, 2026

7.0

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:2.0th

Official 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.

NVD Source

Technical Analysis

CVE-2026-34596 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.0.