CVE-2026-81576 Improper Authentication of Session Handles
Attackers can brute-force weak session identifiers to access other users' license information when CodeMeter Runtime is configured as a server.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-81576?
CVE-2026-81576 is a high-severity authentication bypass vulnerability in wibu-systems-ag codemeter-runtime, published on 27 Aug 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-639
Which versions are affected by CVE-2026-81576?
How do I fix CVE-2026-81576?
No fix has been published for CVE-2026-81576 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-81576 being exploited?
There is no known exploitation of CVE-2026-81576 in the wild and no public exploit code.
Sources
Also known as GHSA-gj9j-5pfx-gc7p.