CVE-2026-81572

Local Privilege Escalation in CodeMeter Runtime on Windows

State: Published
Severity: 7.8 High
Published: Aug 27, 2026
Updated: Aug 28, 2026
Reserved: Aug 27, 2026

Description

In CodeMeter Runtime from version 8.40 to (excluding) 8.41a and 9.00 to (excluding) 9.10, cmu.exe --create-io --file C: creates a predictable temporary file under C:\CM-Stick. The directory and file paths are not properly checked for NTFS reparse points, such as junctions or symbolic links, before file operations are performed. A local attacker can create a junction at the temporary file that points to an arbitrary system path. Because CodeMeter Runtime runs with System privileges, this could allow arbitrary files to be deleted with System privileges and potentially enable local privilege escalation.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	wibu

Weaknesses

CWE-59 Improper link resolution before file access ('link following')

Affected Products

Product	Versions
codemeter-runtimewibu-systems-ag	8.40 to before 8.41aAffected 9.00 to before 9.10Affected

References

https://cdn.wibu.com/fileadmin/wibu_downloads/security_advisories/AdvisoryWIBU-103081.pdfvendor-advisory
https://shelltrail.com/research/local-privilege-escalation-to-system-in-wibu-systems-codemeter-applicationtechnical-description

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