VDB-396131 · CVE-2026-81572 · GCVE-0-2026-81572

Wibu-Systems AG CodeMeter Runtime up to 8.41/9.9 NTFS Reparse Point cmu.exe temp file

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
8.1	$0-$5k	0.60

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Wibu-Systems AG CodeMeter Runtime up to 8.41/9.9. Affected is an unknown function of the file cmu.exe of the component NTFS Reparse Point Handler. The manipulation leads to temp file. This vulnerability is documented as CVE-2026-81572. The attack needs to be performed locally. There is not any exploit available.

Detailsinfo

A vulnerability was found in Wibu-Systems AG CodeMeter Runtime up to 8.41/9.9 and classified as very critical. This issue affects an unknown functionality of the file cmu.exe of the component NTFS Reparse Point Handler. The manipulation with an unknown input leads to a temp file vulnerability. Using CWE to declare the problem leads to CWE-377. Creating and using insecure temporary files can leave application and system data vulnerable to attack. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

It is possible to read the advisory at cdn.wibu.com. The identification of this vulnerability is CVE-2026-81572 since 08/27/2026. The exploitation is known to be easy. Attacking locally is a requirement. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/27/2026).

Upgrading to version 8.41a or 9.10 eliminates this vulnerability.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Wibu-Systems AG

Name

CodeMeter Runtime

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.3
VulDB Meta Temp Score: 8.1

VulDB Base Score: 8.8
VulDB Temp Score: 8.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (wibu): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Temp file
CWE: CWE-377
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: CodeMeter Runtime 8.41a/9.10

Timelineinfo

08/27/2026 Advisory disclosed
08/27/2026 +0 days CVE reserved
08/27/2026 +0 days VulDB entry created
08/27/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: cdn.wibu.com
Status: Confirmed

CVE: CVE-2026-81572 (🔒)
GCVE (CVE): GCVE-0-2026-81572
GCVE (VulDB): GCVE-100-396131

Entryinfo

Created: 08/27/2026 11:52
Changes: 08/27/2026 11:52 (64)
Complete: 🔍
Cache ID: 216::103