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CVE-2026-86077 (GCVE-0-2026-86077)

Vulnerability from cvelistv5 – Published: 2026-09-08 21:28 – Updated: 2026-09-08 21:28
VLAI
Title
n8n: Anonymous Approval-Gate Bypass via Reused resumeToken over the Chat WebSocket
Summary
n8n is an open source workflow automation platform. Prior to 2.37.7 and 2.38.2, the /chat WebSocket route accepted a resumeToken and resumed a paused execution without checking that the target node supported chat messages. An anonymous form submitter who received that token could reuse it on the chat route to release a Send-and-Wait, non-chat HITL, or Wait approval gate. The affected authorization logic is packages/cli/src/chat/chat-execution-manager.ts, where canResumeOverChat did not gate the resume target. This issue is fixed in versions 2.37.7 and 2.38.2.
CWE
Impacted products
Vendor Product Version CPE status
n8n-io n8n Affected: < 2.37.7
Affected: >= 2.38.0, < 2.38.2
guessed Create a notification for this product.
Show details on NVD website

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          "vendor": "n8n-io",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.37.7"
            },
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            }
          ]
        }
      ],
      "descriptions": [
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        }
      ],
      "metrics": [
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            "attackRequirements": "PRESENT",
            "attackVector": "NETWORK",
            "baseScore": 6.3,
            "baseSeverity": "MEDIUM",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "LOW",
            "subIntegrityImpact": "LOW",
            "userInteraction": "NONE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "CWE-862: Missing Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-08T21:28:06.303Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
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          ],
          "url": "https://github.com/n8n-io/n8n/security/advisories/GHSA-35jj-42hp-8gmq"
        },
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        },
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          "name": "https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/n8n-io/n8n/releases/tag/n8n@2.38.2"
        }
      ],
      "source": {
        "advisory": "GHSA-35jj-42hp-8gmq",
        "discovery": "UNKNOWN"
      },
      "title": "n8n: Anonymous Approval-Gate Bypass via Reused resumeToken over the Chat WebSocket"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-86077",
    "datePublished": "2026-09-08T21:28:06.303Z",
    "dateReserved": "2026-09-04T19:34:03.100Z",
    "dateUpdated": "2026-09-08T21:28:06.303Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-09-11",
      "epss": "0.00361",
      "percentile": "0.2941"
    },
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  }
}



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