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CVE-2026-34458

8.8 · HIGH

Sandboxie-Plus is an open source sandbox-based isolation software for Windows.

Published May 5, 2026CWE-93EPSS 0.29%

Overview

CVE-2026-34458 is a high-severity vulnerability. It was published on May 5, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/sandboxie-plus/Sandboxie/releases/tag/v1.17.3GitHubgithub.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-6xqg-2cjq-95qfGitHubgithub.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-6xqg-2cjq-95qf

How CyberStrike helps

Frequently asked questions

What is CVE-2026-34458?

CVE-2026-34458 is a high-severity vulnerability. It was published on May 5, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-34458?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-34458?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-34458?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-34458 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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