Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during documentation generation. This issue is fixed in versions 1.14.6 and 1.15.4.
PUBLISHED5.2CWE-426CWE-436
Backstage: Bypass of MkDocs configuration sanitizer in TechDocs backend
Problem type
Affected products
backstage
backstage
< 1.50.5 - AFFECTED
>= 1.51.0-next.0, < 1.54.6 - AFFECTED
@backstage
plugin-techdocs-node
< 1.14.6 - AFFECTED
>= 1.15.0, < 1.15.4 - AFFECTED
References
https://github.com/backstage/backstage/security/advisories/GHSA-p75x-jh7p-ppcx
https://github.com/backstage/backstage/security/advisories/GHSA-p75x-jh7p-ppcx
https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9
https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9
https://github.com/backstage/backstage/commit/ef92d3d2b76046205c580e7152956514c15640db
https://github.com/backstage/backstage/commit/ef92d3d2b76046205c580e7152956514c15640db
https://github.com/backstage/backstage/releases/tag/v1.50.5
https://github.com/backstage/backstage/releases/tag/v1.50.5
https://github.com/backstage/backstage/releases/tag/v1.54.6
https://github.com/backstage/backstage/releases/tag/v1.54.6
JSON source
https://cveawg.mitre.org/api/cve/CVE-2026-106505Click to expand
{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-106505",
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"dateUpdated": "2026-10-06T21:43:08.370Z",
"dateReserved": "2026-10-06T18:46:47.766Z",
"datePublished": "2026-10-06T21:43:08.370Z",
"state": "PUBLISHED"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M",
"dateUpdated": "2026-10-06T21:43:08.370Z"
},
"title": "Backstage: Bypass of MkDocs configuration sanitizer in TechDocs backend",
"descriptions": [
{
"lang": "en",
"value": "Backstage is an open framework for building developer portals. Prior to 1.14.6 and 1.15.4, the @backstage/plugin-techdocs-node package is affected by bypass of mkdocs configuration sanitizer in techdocs backend. Users with the ability to commit changes to a repository that uses TechDocs can circumvent the MkDocs configuration file sanitizer introduced in response to CVE-2026-25153 and execute arbitrary code on the TechDocs backend host during documentation generation. This issue is fixed in versions 1.14.6 and 1.15.4."
}
],
"affected": [
{
"vendor": "backstage",
"product": "backstage",
"versions": [
{
"version": "< 1.50.5",
"status": "affected"
},
{
"version": ">= 1.51.0-next.0, < 1.54.6",
"status": "affected"
}
]
},
{
"vendor": "@backstage",
"product": "plugin-techdocs-node",
"versions": [
{
"version": "< 1.14.6",
"status": "affected"
},
{
"version": ">= 1.15.0, < 1.15.4",
"status": "affected"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"description": "CWE-426: Untrusted Search Path",
"cweId": "CWE-426",
"type": "CWE"
}
]
},
{
"descriptions": [
{
"lang": "en",
"description": "CWE-436: Interpretation Conflict",
"cweId": "CWE-436",
"type": "CWE"
}
]
}
],
"references": [
{
"url": "https://github.com/backstage/backstage/security/advisories/GHSA-p75x-jh7p-ppcx",
"name": "https://github.com/backstage/backstage/security/advisories/GHSA-p75x-jh7p-ppcx",
"tags": [
"x_refsource_CONFIRM"
]
},
{
"url": "https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9",
"name": "https://github.com/backstage/backstage/commit/a7d995f11a5d27f0efbdbe8bb6c21b06988c79c9",
"tags": [
"x_refsource_MISC"
]
},
{
"url": "https://github.com/backstage/backstage/commit/ef92d3d2b76046205c580e7152956514c15640db",
"name": "https://github.com/backstage/backstage/commit/ef92d3d2b76046205c580e7152956514c15640db",
"tags": [
"x_refsource_MISC"
]
},
{
"url": "https://github.com/backstage/backstage/releases/tag/v1.50.5",
"name": "https://github.com/backstage/backstage/releases/tag/v1.50.5",
"tags": [
"x_refsource_MISC"
]
},
{
"url": "https://github.com/backstage/backstage/releases/tag/v1.54.6",
"name": "https://github.com/backstage/backstage/releases/tag/v1.54.6",
"tags": [
"x_refsource_MISC"
]
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L",
"attackVector": "NETWORK",
"attackComplexity": "HIGH",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "CHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "LOW",
"availabilityImpact": "LOW",
"baseScore": 7.7,
"baseSeverity": "HIGH"
}
}
]
}
}
}