Vulnerability-Lookup

CVE-2026-61560 (GCVE-0-2026-61560)

Vulnerability from cvelistv5 – Published: 2026-09-15 21:09 – Updated: 2026-09-15 21:09

Title

@zereight/mcp-gitlab's unauthenticated arbitrary file read via `upload_markdown` enables PAT exfiltration and full account takeover

Summary

`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab. Prior to version 2.1.27, the SSE transport mode (`SSE=true`) exposes all MCP tools without any authentication. The `upload_markdown` tool reads arbitrary files from the server's local filesystem via an unsanitized `file_path` parameter and uploads them to a GitLab project. Combined, any unauthenticated network-reachable attacker can read `/proc/self/environ` to steal the server's `GITLAB_PERSONAL_ACCESS_TOKEN` and achieve full GitLab account takeover. This is the default configuration for Docker deployments. Version 2.1.27 contains a patch.

Severity

9.8 (Critical)


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

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/zereight/gitlab-mcp/security/a…	x_refsource_CONFIRM
https://github.com/zereight/gitlab-mcp/pull/482	x_refsource_MISC
https://github.com/zereight/gitlab-mcp/pull/554	x_refsource_MISC
https://github.com/zereight/gitlab-mcp/pull/622	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
zereight	gitlab-mcp	Affected: < 2.1.27	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "product": "gitlab-mcp",
          "vendor": "zereight",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.1.27"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab. Prior to version 2.1.27, the SSE transport mode (`SSE=true`) exposes all MCP tools without any authentication. The `upload_markdown` tool reads arbitrary files from the server\u0027s local filesystem via an unsanitized `file_path` parameter and uploads them to a GitLab project. Combined, any unauthenticated network-reachable attacker can read `/proc/self/environ` to steal the server\u0027s `GITLAB_PERSONAL_ACCESS_TOKEN` and achieve full GitLab account takeover. This is the default configuration for Docker deployments. Version 2.1.27 contains a patch."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-22",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\u0027Path Traversal\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-15T21:09:00.405Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-cv3r-c5h8-f4g5",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-cv3r-c5h8-f4g5"
        },
        {
          "name": "https://github.com/zereight/gitlab-mcp/pull/482",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zereight/gitlab-mcp/pull/482"
        },
        {
          "name": "https://github.com/zereight/gitlab-mcp/pull/554",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zereight/gitlab-mcp/pull/554"
        },
        {
          "name": "https://github.com/zereight/gitlab-mcp/pull/622",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/zereight/gitlab-mcp/pull/622"
        }
      ],
      "source": {
        "advisory": "GHSA-cv3r-c5h8-f4g5",
        "discovery": "UNKNOWN"
      },
      "title": "@zereight/mcp-gitlab\u0027s unauthenticated arbitrary file read via `upload_markdown` enables PAT exfiltration and full account takeover"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-61560",
    "datePublished": "2026-09-15T21:09:00.405Z",
    "dateReserved": "2026-07-10T16:48:39.923Z",
    "dateUpdated": "2026-09-15T21:09:00.405Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-61560\",\"sourceIdentifier\":\"security-advisories@github.com\",\"published\":\"2026-09-15T22:16:58.040\",\"lastModified\":\"2026-09-15T22:16:58.040\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab. Prior to version 2.1.27, the SSE transport mode (`SSE=true`) exposes all MCP tools without any authentication. The `upload_markdown` tool reads arbitrary files from the server\u0027s local filesystem via an unsanitized `file_path` parameter and uploads them to a GitLab project. Combined, any unauthenticated network-reachable attacker can read `/proc/self/environ` to steal the server\u0027s `GITLAB_PERSONAL_ACCESS_TOKEN` and achieve full GitLab account takeover. This is the default configuration for Docker deployments. Version 2.1.27 contains a patch.\"}],\"affected\":[{\"source\":\"security-advisories@github.com\",\"affectedData\":[{\"vendor\":\"zereight\",\"product\":\"gitlab-mcp\",\"versions\":[{\"version\":\"\u003c 2.1.27\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"security-advisories@github.com\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-22\"}]}],\"references\":[{\"url\":\"https://github.com/zereight/gitlab-mcp/pull/482\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/zereight/gitlab-mcp/pull/554\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/zereight/gitlab-mcp/pull/622\",\"source\":\"security-advisories@github.com\"},{\"url\":\"https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-cv3r-c5h8-f4g5\",\"source\":\"security-advisories@github.com\"}]}}"
  }
}

FKIE_CVE-2026-61560

Vulnerability from fkie_nvd - Published: 2026-09-15 22:16 - Updated: 2026-09-15 22:16

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/zereight/gitlab-mcp/pull/482
	security-advisories@github.com	https://github.com/zereight/gitlab-mcp/pull/554
	security-advisories@github.com	https://github.com/zereight/gitlab-mcp/pull/622
	security-advisories@github.com	https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-cv3r-c5h8-f4g5

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "gitlab-mcp",
          "vendor": "zereight",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.1.27"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "`@zereight/mcp-gitlab` is a Model Context Protocol server for GitLab. Prior to version 2.1.27, the SSE transport mode (`SSE=true`) exposes all MCP tools without any authentication. The `upload_markdown` tool reads arbitrary files from the server\u0027s local filesystem via an unsanitized `file_path` parameter and uploads them to a GitLab project. Combined, any unauthenticated network-reachable attacker can read `/proc/self/environ` to steal the server\u0027s `GITLAB_PERSONAL_ACCESS_TOKEN` and achieve full GitLab account takeover. This is the default configuration for Docker deployments. Version 2.1.27 contains a patch."
    }
  ],
  "id": "CVE-2026-61560",
  "lastModified": "2026-09-15T22:16:58.040",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-15T22:16:58.040",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zereight/gitlab-mcp/pull/482"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zereight/gitlab-mcp/pull/554"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zereight/gitlab-mcp/pull/622"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/zereight/gitlab-mcp/security/advisories/GHSA-cv3r-c5h8-f4g5"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Received",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

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.