CVE-2026-81576Network attack vector

Authenticated license data disclosure via brute-forced SIDs

Published Aug 27, 2026 · Updated Aug 27, 2026

Authorization bypass in CodeMeter Runtime before 8.41a and 9.10 allows remote authenticated users to read other sessions' license data. The server issues a handle for each connection, then accepts its cryptographically weak SID as the handle's sole authenticator, enabling SID brute force and recovery of another handle number. Server mode and an existing low-privilege session are required; exploitation discloses license information without reported data modification or service interruption.

CVSS severity7.7
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in CodeMeter Runtime before 8.41a and 9.10 allows remote authenticated users to read other sessions' license data. The server issues a handle for each connection, then accepts its cryptographically weak SID as the handle's sole authenticator, enabling SID brute force and recovery of another handle number. Server mode and an existing low-privilege session are required; exploitation discloses license information without reported data modification or service interruption.

The record

CVE
CVE-2026-81576
Published
Aug 27, 2026
Updated
Aug 27, 2026
Vendor
WIBU-SYSTEMS AG
Product
CodeMeter Runtime
Classifications
CWE-639, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.00
  2. Affected versionversion=7.00
  3. Affected versionversion=8.00 <8.41a
  4. Affected versionversion=9.00 <9.10

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

WIBU-SYSTEMS AG · CodeMeter Runtimeversion=6.00; version=7.00; version=8.00 <8.41a; version=9.00 <9.10

Published CVSS scores

7.7WIBU-SYSTEMS AGCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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