CVE-2026-40939 DSF: Missing Session Timeout for OIDC Sessions
Attackers can maintain indefinite access via expired OIDC sessions due to missing inactivity timeouts in the Data Sharing Framework.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40939?
CVE-2026-40939 is a medium-severity missing authorization vulnerability in datasharingframework dsf, published on 21 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
The Data Sharing Framework (DSF) implements a distributed process engine based on the BPMN 2.0 and FHIR R4 standards. Prior to 2.1.0, OIDC-authenticated sessions had no configured maximum inactivity timeout. Sessions persisted indefinitely after login, even after the OIDC access token expired. This vulnerability is fixed in 2.1.0.
Weakness: CWE-613
Which versions are affected by CVE-2026-40939?
6 open source packages ship an affected version, including dev.dsf:dsf-bpe-server, dev.dsf:dsf-common-jetty and dev.dsf:dsf-fhir-server.
| Package | Affected | Fixed in |
|---|---|---|
dev.dsf:dsf-bpe-server Maven | All versions | None |
dev.dsf:dsf-bpe-server Maven | All versions | None |
dev.dsf:dsf-common-jetty Maven | All versions | None |
dev.dsf:dsf-common-jetty Maven | All versions | None |
dev.dsf:dsf-fhir-server Maven | All versions | None |
dev.dsf:dsf-fhir-server Maven | All versions | None |
How do I fix CVE-2026-40939?
No fix has been published for CVE-2026-40939 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-40939 being exploited?
There is no known exploitation of CVE-2026-40939 in the wild and no public exploit code.
Sources
Also known as GHSA-gj7p-595x-qwf5.