Vulnerability · Published May 5, 2026 · Assigned by GitHub_M

CVE-2026-34458Sandboxie-Plus privilege escalation via INI CRLF injection bypassing EditAdminOnly

Critical 9.3

In plain English

A critical-severity security flaw in Sandboxie from sandboxie-plus. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 17% of all known vulnerabilities).

Severity (CVSS 4.0)9.3Critical

Exploit odds (30 days)0.3%top 83.4% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
sandboxie-plus	Sandboxie	< 1.17.3

Weakness: CWE-93 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

References

https://github.com/sandboxie-plus/Sandboxie/security/advisories/GHSA-6xqg-2cjq-95qf x_refsource_CONFIRM
https://github.com/sandboxie-plus/Sandboxie/releases/tag/v1.17.3 x_refsource_MISC