CVE-2026-5423 (GCVE-0-2026-5423)

Vulnerability from cvelistv5 – Published: 2026-08-06 15:15 – Updated: 2026-08-06 15:45
VLAI
Title
Subscription Authentication Bypass via Unverified connectionParams.jwt
Summary
@neo4j/graphql library versions prior to 7.5.6 fail to verify the authenticity of a client-supplied, pre-decoded JWT object passed through GraphQL subscription connectionParams. As a result, any unauthenticated remote client that can open a GraphQL-over-WebSocket connection can forge arbitrary JWT claims (e.g. sub, roles) in connectionParams.jwt and have them accepted as authenticated identity for the purposes of @authentication and @subscriptionsAuthorization directive evaluation. This allows a fully unauthenticated attacker to receive subscription events that should be restricted to specific authenticated roles/users. Upgrade the library to versions 7.5.6+ or 5.12.14+. v6 is end-of-life and will not receive a fix.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-06 15:45 UTC
CWE
  • CWE-302 - Authentication bypass by Assumed-Immutable data
References
Impacted products
Vendor Product Version CPE status
neo4j graphql Affected: 7.0.0 , < 7.5.6 (semver)
Affected: 5.0.0 , < 5.12.14 (semver)
Affected: 6.0.0 , ≤ 6.6.4 (semver)
    cpe:2.3:a:neo4j:graphql:*:*:*:*:*:*:*:*
    cpe:2.3:a:neo4j:graphql:*:*:*:*:*:*:*:*
    cpe:2.3:a:neo4j:graphql:*:*:*:*:*:*:*:*
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                  "type": "CWE"
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-06T15:15:29.124Z",
            "orgId": "3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6",
            "shortName": "Neo4j"
          },
          "references": [
            {
              "tags": [
                "vendor-advisory"
              ],
              "url": "https://neo4j.com/security/CVE-2026-5423"
            },
            {
              "tags": [
                "third-party-advisory"
              ],
              "url": "https://github.com/neo4j/graphql/security/advisories/GHSA-fcpg-3fw5-vc65"
            }
          ],
          "solutions": [
            {
              "lang": "en",
              "supportingMedia": [
                {
                  "base64": false,
                  "type": "text/html",
                  "value": "\u003cp\u003eFixed in 5.12.14 (LTS) and 7.5.6 (current). The 6.x line is end-of-life and will not receive a patch; users on 6.x must upgrade to 5.12.14+ or 7.5.6+.\u003c/p\u003e"
                }
              ],
              "value": "Fixed in 5.12.14 (LTS) and 7.5.6 (current). The 6.x line is end-of-life and will not receive a patch; users on 6.x must upgrade to 5.12.14+ or 7.5.6+."
            }
          ],
          "source": {
            "discovery": "EXTERNAL"
          },
          "title": "Subscription Authentication Bypass via Unverified connectionParams.jwt",
          "x_generator": {
            "engine": "Vulnogram 1.0.2"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "3b236295-4ccd-4a1f-a1c1-a72eecc8d7b6",
        "assignerShortName": "Neo4j",
        "cveId": "CVE-2026-5423",
        "datePublished": "2026-08-06T15:15:29.124Z",
        "dateReserved": "2026-04-02T13:17:29.975Z",
        "dateUpdated": "2026-08-06T15:45:22.183Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.

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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.


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