Is CVE-2026-34458 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-34458 being exploited in the wild.

How severe is CVE-2026-34458?

High severity, with a CVSS score of 8.8, published 5 May 2026.

Is there a fix for CVE-2026-34458?

A patch was published on 2026-03-29: Version 1.17.3 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-34458 attacked?

It is attacked with local access, in a network appliance.

Am I affected by CVE-2026-34458?

Check whether you run Sandboxie-Plus Sandboxie or Sandboxie-Plus at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-34458: Sandboxie-Plus INI injection and privilege escalation

CVE-2026-34458 · Severity: high · CVSS 8.8 · Published 2026-05-05

Sandboxie-Plus is a security tool used to run applications in isolated environments (sandboxes) to protect the rest of the computer from malicious software. A vulnerability in how the software handles configuration updates allows a standard user to bypass security restrictions and modify global settings. By exploiting this, an attacker can escape the sandbox and gain full control over the Windows operating system with SYSTEM-level privileges.

Technologies: Sandboxie-Plus Sandboxie, Sandboxie-Plus. Vendors: Sandboxie-Plus.

Quick answers

Is CVE-2026-34458 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-34458 being exploited in the wild.
How severe is CVE-2026-34458?: High severity, with a CVSS score of 8.8, published 5 May 2026.
Which products and versions are affected?: Sandboxie-Plus <= 1.17.2.
Is there a fix for CVE-2026-34458?: A patch was published on 2026-03-29: Version 1.17.3 released Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-34458 attacked?: It is attacked with local access, in a network appliance.
Am I affected by CVE-2026-34458?: Check whether you run Sandboxie-Plus Sandboxie or Sandboxie-Plus at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

An INI injection vulnerability exists in the background service of Sandboxie-Plus due to improper neutralization of CRLF sequences in IPC messages. The service intentionally skips authorization checks (bypassing EditAdminOnly and ConfigPassword) for settings starting with 'UserSettings_'. Attackers can use MSGID_SBIE_INI_ADD_SETTING or MSGID_SBIE_INI_SET_SETTING to inject CRLF characters into the 'value' or 'setting' parameters. When the service writes these unsanitized strings to the global Sandboxie.ini file, it allows the attacker to define new, unrestricted sandbox sections. This leads to sandbox escape and local privilege escalation to SYSTEM. The issue is fixed in version 1.17.3.

Affected products

sandboxie-plus Sandboxie-Plus <= 1.17.2

Timeline

2026-03-29: patched: Version 1.17.3 released
2026-05-04: advisory: Vendor security advisory published via GitHub
2026-05-05: disclosed: CVE-2026-34458 published

References

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