Description
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.
Published: 2026-08-27
Score: 7.8 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Impact

An identified flaw in CodeMeter Runtime allows a local attacker to create a predictable temporary file within the \'C:\CM-Stick\' directory. Because the application does not validate NTFS reparse points, a malicious user can construct a junction or symbolic link that redirects file operations to arbitrary system paths. When CodeMeter Runtime, running with System privileges, performs these operations, it can delete any file at the resolved location, thereby elevating the attacker's privileges on the system.

Affected Systems

The vulnerability affects the CodeMeter Runtime product from Wibu Systems AG, which operates on Windows platforms. Specific version information was not disclosed by the CNA. Users running any installations of this runtime on Windows are potentially impacted.

Risk and Exploitability

The CVSS score of 7.8 classifies this flaw as High severity. The EPSS score is not available, making it unclear how often exploitation occurs currently, and the vulnerability is not listed in the CISA KEV catalog. The attack requires local access and the ability to create NTFS junctions; once the attacker controls this path manipulation, they can delete files with System-level rights, potentially enabling full local privilege escalation. Given the lack of a publicly disclosed exploit, the likelihood is uncertain, yet the high impact warrants pre‑emptive action.

Generated by OpenCVE AI on August 27, 2026 at 10:40 UTC.

Remediation

No vendor fix or workaround currently provided.

OpenCVE Recommended Actions

  • Apply Wibu Systems’ latest CodeMeter Runtime patch or upgrade to a version that validates temporary file paths against reparse points.
  • Delete the existing C:\CM-Stick directory and any junctions or symbolic links created by previous installations to remove potential attack vectors.
  • Implement monitoring or scanning to detect unexpected creation of reparse points or abnormal file deletions by CodeMeter Runtime until the patch is applied.

Generated by OpenCVE AI on August 27, 2026 at 10:40 UTC.

Tracking

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Advisories

No advisories yet.

History

Thu, 27 Aug 2026 09:30:00 +0000

Type Values Removed Values Added
Description 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.
Title Local Privilege Escalation in CodeMeter Runtime on Windows
First Time appeared Wibu-systems-ag
Wibu-systems-ag codemeter-runtime
Weaknesses CWE-59
CPEs cpe:2.3:a:wibu-systems-ag:codemeter-runtime:*:*:windows:*:*:*:*:*
Vendors & Products Wibu-systems-ag
Wibu-systems-ag codemeter-runtime
References
Metrics cvssV3_1

{'score': 7.8, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'}


Subscriptions

Wibu-systems-ag Codemeter-runtime
cve-icon MITRE

Status: PUBLISHED

Assigner: wibu

Published:

Updated: 2026-08-27T07:06:17.884Z

Reserved: 2026-08-27T07:01:24.780Z

Link: CVE-2026-81572

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-27T10:16:39.810

Modified: 2026-08-27T10:16:39.810

Link: CVE-2026-81572

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-27T10:45:17Z

Weaknesses
  • CWE-59

    Improper Link Resolution Before File Access ('Link Following')