Vulnerability-Lookup

GHSA-4G9C-3X4P-MFPP

Vulnerability from github – Published: 2026-04-28 15:30 – Updated: 2026-05-06 19:59

Summary

Spring gRPC SecurityContext leaks across requests upon authorization failure

Details

When an authenticated user is denied access to a gRPC method, their authenticated identity remains bound to the gRPC worker thread and can be inherited by a subsequent unauthenticated request on the same thread. This may allow the subsequent user to gain escalated permissions.

Affected versions: Spring gRPC: 1.0.0 - 1.0.2 (fixed in 1.0.3). Older, unsupported versions are also affected.

Severity ?

4.2 (Medium)


                  
                    CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Maven",
        "name": "org.springframework.grpc:spring-grpc"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.0.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40968"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-653"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-06T19:59:34Z",
    "nvd_published_at": "2026-04-28T15:16:30Z",
    "severity": "MODERATE"
  },
  "details": "When an authenticated user is denied access to a gRPC method, their authenticated identity remains bound to the gRPC worker thread and can be inherited by a subsequent unauthenticated request on the same thread. This may allow the subsequent user to gain escalated permissions.\n\nAffected versions:\nSpring gRPC: 1.0.0 - 1.0.2 (fixed in 1.0.3). Older, unsupported versions are also affected.",
  "id": "GHSA-4g9c-3x4p-mfpp",
  "modified": "2026-05-06T19:59:34Z",
  "published": "2026-04-28T15:30:51Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40968"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/spring-projects/spring-grpc"
    },
    {
      "type": "WEB",
      "url": "https://spring.io/security/cve-2026-40968"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Spring gRPC SecurityContext leaks across requests upon authorization failure"
}

CVE-2026-40968 (GCVE-0-2026-40968)

Vulnerability from cvelistv5 – Published: 2026-04-28 13:42 – Updated: 2026-04-28 14:36

Title

Spring gRPC SecurityContext leaks across requests on authorization failure

Summary

Severity ?

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

CWE

CWE-653 - Improper Isolation or Compartmentalization

Assigner

vmware

References

URL

Tags

https://spring.io/security/cve-2026-40968

Impacted products

	Vendor	Product	Version
	Spring	Spring gRPC	Affected: 1.0.0 , < 1.0.3 (custom)

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JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-40968",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-28T14:36:11.607363Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-28T14:36:35.953Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Spring gRPC",
          "vendor": "Spring",
          "versions": [
            {
              "lessThan": "1.0.3",
              "status": "affected",
              "version": "1.0.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "supportingMedia": [
            {
              "base64": false,
              "type": "text/html",
              "value": "When an authenticated user is denied access to a gRPC method, their authenticated identity remains bound to the gRPC worker thread and can be inherited by a subsequent unauthenticated request on the same thread. This may allow the subsequent user to gain escalated permissions.\u003cbr\u003e\u003cbr\u003eAffected versions:\u003cbr\u003eSpring gRPC: 1.0.0 - 1.0.2 (fixed in 1.0.3). Older, unsupported versions are also affected."
            }
          ],
          "value": "When an authenticated user is denied access to a gRPC method, their authenticated identity remains bound to the gRPC worker thread and can be inherited by a subsequent unauthenticated request on the same thread. This may allow the subsequent user to gain escalated permissions.\n\nAffected versions:\nSpring gRPC: 1.0.0 - 1.0.2 (fixed in 1.0.3). Older, unsupported versions are also affected."
        }
      ],
      "impacts": [
        {
          "descriptions": [
            {
              "lang": "en",
              "value": "A subsequent request on the same gRPC worker thread may inherit a prior user\u2019s authenticated identity after an authorization failure, enabling privilege escalation (CVSS v3.1: low confidentiality and integrity impact)."
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
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      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-653",
              "description": "CWE-653: Improper Isolation or Compartmentalization",
              "lang": "en",
              "type": "CWE"
            }
          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-28T13:42:35.525Z",
        "orgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
        "shortName": "vmware"
      },
      "references": [
        {
          "url": "https://spring.io/security/cve-2026-40968"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "Spring gRPC SecurityContext leaks across requests on authorization failure"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "dcf2e128-44bd-42ed-91e8-88f912c1401d",
    "assignerShortName": "vmware",
    "cveId": "CVE-2026-40968",
    "datePublished": "2026-04-28T13:42:35.525Z",
    "dateReserved": "2026-04-16T02:18:56.133Z",
    "dateUpdated": "2026-04-28T14:36:35.953Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Action not permitted

GHSA-4G9C-3X4P-MFPP

CVE-2026-40968 (GCVE-0-2026-40968)

Tags

Sightings

Nomenclature