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CVE-2026-81576— Improper Authentication of Session Handles

Quick assessment

Affected
wibu-systems-ag codemeter-runtime
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WIBU-SYSTEMS CodeMeter Runtime是德国WIBU-SYSTEMS公司的一款软件加密与授权管理运行时组件。 WIBU-SYSTEMS CodeMeter Runtime 8.41a之前版本和9.10之前版本存在授权问题漏洞，该漏洞源于为每个连接发布句柄并依赖加密强度弱的SID作为唯一验证器，可能导致攻击者暴力破解SID，恢复其他会话的句柄号，并读取属于其他句柄的许可证信息。

CVSS 7.7 · High EPSS 0.34% · P28

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 4

VendorProduct Version RangeStatus
wibu-systems-ag codemeter-runtime 9.00< 9.10 affected
8.00< 8.41a affected
7.00 affected
6.00 affected
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I. Basic Information for CVE-2026-81576

Vulnerability Information
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Vulnerability Title
Improper Authentication of Session Handles
Source: CVE Program / CVE List V5
Vulnerability Description
If configured as a server, CodeMeter Runtime before versions 8.41a and 9.10 issues handles per connection and relies on a cryptographically weak SID as sole authenticator. An attacker can brute-force the SID, recover another session's handle number, and read license information belonging to another handle.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
WIBU-SYSTEMS CodeMeter Runtime 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WIBU-SYSTEMS CodeMeter Runtime是德国WIBU-SYSTEMS公司的一款软件加密与授权管理运行时组件。 WIBU-SYSTEMS CodeMeter Runtime 8.41a之前版本和9.10之前版本存在授权问题漏洞，该漏洞源于为每个连接发布句柄并依赖加密强度弱的SID作为唯一验证器，可能导致攻击者暴力破解SID，恢复其他会话的句柄号，并读取属于其他句柄的许可证信息。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wibu-systems-ag codemeter-runtime 9.00 ~ 9.10 -

II. Public POCs for CVE-2026-81576

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-81576

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Vendor Advisories for CVE-2026-81576 (1)

Same Patch Batch · wibu-systems-ag · 2026-08-27 · 7 CVEs total

CVE-2026-81581 8.8 HIGH User input in WibuKey is used (without proper sanitization) to compute the address of a po
CVE-2026-81579 8.8 HIGH An untrusted Pointer Dereference can be exploited to escalate privileges by an unprivilege
CVE-2026-81573 8.6 HIGH Improper Access Control in Local-Only Configuration Commands
CVE-2026-81574 8.2 HIGH Format String Vulnerability in Logger
CVE-2026-81572 7.8 HIGH Local Privilege Escalation in CodeMeter Runtime on Windows
CVE-2026-81575 7.5 HIGH Missing Sanity Checks for Buffer Lengths

IV. Related Vulnerabilities

Same product: codemeter-runtime
Same vendor: wibu-systems-ag
Same weakness: CWE-639