What is CVE-2026-34458?

CVE-2026-34458 is a high-severity vulnerability in Sandboxie-plus Sandboxie, classified under CRLF Injection. CVSS score: 8.8/10. Published 2026-05-05.

How severe is CVE-2026-34458?

High severity. CVSS v3 base score is 8.8 out of 10.

Vulnerability in Sandboxie-plus Sandboxie

CVE-2026-34458

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 ConfigPass…

Vulnerability class: CRLF Injection

EPSS: 0.000 (4.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Sandboxie-plus Sandboxie — versions < 1.17.3

Weakness classification (CWE)

CWE-93 — CRLF Injection

References

https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-6xqg-2cjq-95qf (x_refsource_CONFIRM, Exploit, Vendor Advisory)
https://github.com/sandboxie-plus/Sandboxie/releases/tag/v1.17.3 (Patch, x_refsource_MISC, Release Notes)

Frequently asked questions

What is CVE-2026-34458?: CVE-2026-34458 is a high-severity vulnerability in Sandboxie-plus Sandboxie, classified under CRLF Injection. CVSS score: 8.8/10. Published 2026-05-05.
How severe is CVE-2026-34458?: High severity. CVSS v3 base score is 8.8 out of 10.