{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-106558",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-10-06T20:31:59.017Z",
        "datePublished": "2026-10-07T14:45:25.679Z",
        "dateUpdated": "2026-10-10T02:27:17.131Z"
    },
    "containers": {
        "cna": {
            "title": "Backstage: Improper validation of TechDocs MkDocs configuration",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-502",
                            "lang": "en",
                            "description": "CWE-502: Deserialization of Untrusted Data",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "HIGH",
                        "baseScore": 8.8,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "HIGH",
                        "privilegesRequired": "LOW",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/backstage/backstage/security/advisories/GHSA-qmw3-745m-w99g",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/backstage/backstage/security/advisories/GHSA-qmw3-745m-w99g"
                },
                {
                    "name": "https://github.com/backstage/backstage/commit/32723a0fe4e12ed80535fc65d5331765c55aa91b",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/backstage/backstage/commit/32723a0fe4e12ed80535fc65d5331765c55aa91b"
                },
                {
                    "name": "https://github.com/backstage/backstage/commit/944edb51c8524d3664b18f2d57ba101b1c93b709",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/backstage/backstage/commit/944edb51c8524d3664b18f2d57ba101b1c93b709"
                },
                {
                    "name": "https://github.com/backstage/backstage/commit/f18e9abcc6051491862b15e4fc60e69f8d52310c",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/backstage/backstage/commit/f18e9abcc6051491862b15e4fc60e69f8d52310c"
                },
                {
                    "name": "https://github.com/backstage/backstage/releases/tag/v1.50.7",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/backstage/backstage/releases/tag/v1.50.7"
                },
                {
                    "name": "https://github.com/backstage/backstage/releases/tag/v1.54.9",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/backstage/backstage/releases/tag/v1.54.9"
                },
                {
                    "name": "https://github.com/backstage/backstage/releases/tag/v1.55.2",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/backstage/backstage/releases/tag/v1.55.2"
                }
            ],
            "affected": [
                {
                    "vendor": "backstage",
                    "product": "backstage",
                    "versions": [
                        {
                            "version": "< 1.50.7",
                            "status": "affected"
                        },
                        {
                            "version": ">= 1.51.0-next.0, < 1.54.9",
                            "status": "affected"
                        },
                        {
                            "version": ">= 1.55.0-next.0, < 1.55.2",
                            "status": "affected"
                        }
                    ]
                },
                {
                    "vendor": "@backstage",
                    "product": "plugin-techdocs-node",
                    "versions": [
                        {
                            "version": "< 1.14.8",
                            "status": "affected"
                        },
                        {
                            "version": ">= 1.15.0, < 1.15.6",
                            "status": "affected"
                        },
                        {
                            "version": ">= 2.0.0, < 2.0.1",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-10-07T14:45:25.679Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Backstage is an open framework for building developer portals. Prior to 1.14.8, 1.15.6, and 2.0.1, the @backstage/plugin-techdocs-node package improperly validated mapping-style markdown_extensions configuration. An authenticated attacker who can register or influence an SCM-backed documentation source may bypass TechDocs sanitization and cause Python objects to be imported and instantiated in the generator runtime, leading to arbitrary code execution. Earlier fixes in versions 1.14.6 and 1.15.4 did not fully address the supported mapping representation of markdown_extensions. Impact is greatest when documentation generation runs with backend credentials, filesystem access, or internal network access. This issue is fixed in versions 1.14.8, 1.15.6, and 2.0.1."
                }
            ],
            "source": {
                "advisory": "GHSA-qmw3-745m-w99g",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-10-10T02:27:02.807453Z",
                                "id": "CVE-2026-106558",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
                                    {
                                        "Automatable": "no"
                                    },
                                    {
                                        "Technical Impact": "total"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-10-10T02:27:17.131Z"
                }
            }
        ]
    }
}