Vulnerability-Lookup

CVE-2026-40939 (GCVE-0-2026-40939)

Vulnerability from cvelistv5 – Published: 2026-04-21 21:07 – Updated: 2026-04-22 17:44

Title

DSF: Missing Session Timeout for OIDC Sessions

Summary

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.

Severity

6.8 (Medium)


                        
                          CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-22 17:43 UTC

CWE

CWE-613 - Insufficient Session Expiration

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/datasharingframework/dsf/secur…	x_refsource_CONFIRM
https://github.com/datasharingframework/dsf/commi…	x_refsource_MISC
https://dsf.dev/operations/v2.1.0/bpe/oidc.html	x_refsource_MISC
https://dsf.dev/operations/v2.1.0/fhir/oidc.html	x_refsource_MISC

Impacted products

4 products

Vendor	Product	Version	CPE status
datasharingframework	dsf	Affected: < 2.1.0	guessed
dev.dsf	dsf-bpe-server	Affected: < 2.1.0	guessed
dev.dsf	dsf-common-jetty	Affected: < 2.1.0	guessed
dev.dsf	dsf-fhir-server	Affected: < 2.1.0	guessed

Show details on NVD website

JSON

To clipboard

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                "id": "CVE-2026-40939",
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                "role": "CISA Coordinator",
                "timestamp": "2026-04-22T17:43:47.019567Z",
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FKIE_CVE-2026-40939

Vulnerability from fkie_nvd - Published: 2026-04-21 22:16 - Updated: 2026-06-17 10:45

Severity

6.8 (Medium) - CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://dsf.dev/operations/v2.1.0/bpe/oidc.html
	security-advisories@github.com	https://dsf.dev/operations/v2.1.0/fhir/oidc.html
	security-advisories@github.com	https://github.com/datasharingframework/dsf/commit/f4ecb002f7d12642f92da6b79371ed367d0140e7
	security-advisories@github.com	https://github.com/datasharingframework/dsf/security/advisories/GHSA-gj7p-595x-qwf5

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "dsf",
          "vendor": "datasharingframework",
          "versions": [
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              "status": "affected",
              "version": "\u003c 2.1.0"
            }
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        },
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            {
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              "version": "\u003c 2.1.0"
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          ]
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          "vendor": "dev.dsf",
          "versions": [
            {
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              "version": "\u003c 2.1.0"
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          ]
        },
        {
          "product": "dsf-fhir-server",
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    }
  ],
  "id": "CVE-2026-40939",
  "lastModified": "2026-06-17T10:45:55.000",
  "metrics": {
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          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
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          "attackVector": "PHYSICAL",
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          "baseScore": 6.8,
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          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
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  "references": [
    {
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      "url": "https://dsf.dev/operations/v2.1.0/bpe/oidc.html"
    },
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      "source": "security-advisories@github.com",
      "url": "https://dsf.dev/operations/v2.1.0/fhir/oidc.html"
    },
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GHSA-GJ7P-595X-QWF5

Vulnerability from github – Published: 2026-04-15 19:19 – Updated: 2026-04-24 21:11

Summary

Data Sharing Framework is Missing Session Timeout for OIDC Sessions

Details

Affected Components

DSF FHIR Server with enabled OIDC authentication. DSF BPE Server with enabled OIDC authentication.

Summary

OIDC-authenticated sessions had no configured maximum inactivity timeout. Sessions persisted indefinitely after login, even after the OIDC access token expired.

Impact

If a user logs in via OIDC and leaves their browser without explicitly logging out, the session remains valid indefinitely. Another person using the same browser can access the DSF UI with the previous user's permissions. This is a realistic threat in hospital environments with shared workstations.

Only affects OIDC browser sessions, not relevant for mTLS machine-to-machine communication.

Fix (commits f4ecb00, 7d25fea)

Added configurable session timeout via dev.dsf.server.auth.oidc.session.timeout (default: PT30M).
Enabled logoutWhenIdTokenIsExpired(true) in OpenID configuration to tie session lifetime to token lifetime.
Websocket sessions are now closed with VIOLATED_POLICY when credentials expire, prevents stale websocket connections from continuing to receive events after session timeout.

Severity

6.8 (Medium)


                  
                    CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 2.1.0"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "dev.dsf:dsf-common-jetty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 2.1.0"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "dev.dsf:dsf-fhir-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 2.1.0"
      },
      "package": {
        "ecosystem": "Maven",
        "name": "dev.dsf:dsf-bpe-server"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40939"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-613"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-15T19:19:43Z",
    "nvd_published_at": "2026-04-21T22:16:19Z",
    "severity": "MODERATE"
  },
  "details": "### Affected Components\nDSF FHIR Server with enabled [OIDC authentication](https://dsf.dev/operations/v2.1.0/fhir/oidc.html).\nDSF BPE Server with enabled [OIDC authentication](https://dsf.dev/operations/v2.1.0/bpe/oidc.html).\n\n### Summary\nOIDC-authenticated sessions had no configured maximum inactivity timeout. Sessions persisted indefinitely after login, even after the OIDC access token expired.\n\n### Impact\nIf a user logs in via OIDC and leaves their browser without explicitly logging out, the session remains valid indefinitely. Another person using the same browser can access the DSF UI with the previous user\u0027s permissions. This is a realistic threat in hospital environments with shared workstations.\n\nOnly affects OIDC browser sessions, not relevant for mTLS machine-to-machine communication.\n\n### Fix (commits f4ecb00, 7d25fea)\n- Added configurable session timeout via `dev.dsf.server.auth.oidc.session.timeout` (default: `PT30M`).\n- Enabled `logoutWhenIdTokenIsExpired(true)` in OpenID configuration to tie session lifetime to token lifetime.\n- Websocket sessions are now closed with `VIOLATED_POLICY` when credentials expire, prevents stale websocket connections from continuing to receive events after session timeout.",
  "id": "GHSA-gj7p-595x-qwf5",
  "modified": "2026-04-24T21:11:02Z",
  "published": "2026-04-15T19:19:43Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/datasharingframework/dsf/security/advisories/GHSA-gj7p-595x-qwf5"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40939"
    },
    {
      "type": "WEB",
      "url": "https://github.com/datasharingframework/dsf/commit/7d25feafb83d66cb59985ac88568b67d937b1937"
    },
    {
      "type": "WEB",
      "url": "https://github.com/datasharingframework/dsf/commit/f4ecb002f7d12642f92da6b79371ed367d0140e7"
    },
    {
      "type": "WEB",
      "url": "https://dsf.dev/operations/v2.1.0/bpe/oidc.html"
    },
    {
      "type": "WEB",
      "url": "https://dsf.dev/operations/v2.1.0/fhir/oidc.html"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/datasharingframework/dsf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Data Sharing Framework is Missing Session Timeout for OIDC Sessions"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-40939 (GCVE-0-2026-40939)

FKIE_CVE-2026-40939

GHSA-GJ7P-595X-QWF5

Affected Components

Summary

Impact

Fix (commits f4ecb00, 7d25fea)

Tags

Sightings

Nomenclature

Related by attack behaviour