High
Backstage: Improper validation of MkDocs plugin configuration in TechDocs
Type: advisorySources: OSV
Backstage is an open framework for building developer portals. From 0.11.12 until 1.14.7 and 1.15.5, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs plugin configuration in techdocs. An authenticated attacker with control over a TechDocs source repository could cause a documentation build to retrieve and publish data from network locations reachable by the build environment. Exposure depends on deployment topology, build mode, and target endpoint protections. Modern cloud metadata services that require tokens or special headers are not directly accessible through the affected behavior. This issue is fixed in @backstage/plugin-techdocs-node versions 1.14.7 and 1.15.5.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-106455
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 12:09 UTC · Revision 1
Source evidence
Backstage: Improper validation of MkDocs plugin configuration in TechDocs
core-osv · Original sourcePublished 6 Oct 2026, 20:06 UTC
Backstage is an open framework for building developer portals. From 0.11.12 until 1.14.7 and 1.15.5, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs plugin configuration in techdocs. An authenticated attacker with control over a TechDocs source repository could cause a documentation build to retrieve and publish data from network locations reachable by the build environment. Exposure depends on deployment topology, build mode, and target endpoint protections. Modern cloud metadata services that require tokens or special headers are not directly accessible through the affected behavior. This issue is fixed in @backstage/plugin-techdocs-node versions 1.14.7 and 1.15.5.
osv:CVE-2026-106455
Complete source record
{
"id": "9c147c5e1b53a8c8cda8f4462d0c0d8fe06057b77880225659a56aa84e4a8613",
"url": "https://osv.dev/vulnerability/CVE-2026-106455",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Backstage: Improper validation of MkDocs plugin configuration in TechDocs",
"summary": "Backstage is an open framework for building developer portals. From 0.11.12 until 1.14.7 and 1.15.5, the @backstage/plugin-techdocs-node package is affected by improper validation of mkdocs plugin configuration in techdocs. An authenticated attacker with control over a TechDocs source repository could cause a documentation build to retrieve and publish data from network locations reachable by the build environment. Exposure depends on deployment topology, build mode, and target endpoint protections. Modern cloud metadata services that require tokens or special headers are not directly accessible through the affected behavior. This issue is fixed in @backstage/plugin-techdocs-node versions 1.14.7 and 1.15.5.",
"evidence": "osv:CVE-2026-106455",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-106455",
"aliases": [
"CVE-2026-106455",
"GHSA-q38j-6vcm-2f5m"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/backstage/backstage",
"type": "GIT",
"events": [
{
"introduced": "9b46fcf52c465f3f53d53c257547ef784c11e8cd"
},
{
"fixed": "0f1b86f07004a0afc1958281253d5d13bb1e1cc8"
},
{
"introduced": "d7c94cba92159b2f427a412d72381b294575193f"
},
{
"fixed": "b565780781014c16ad5673facb953fc24ec4d969"
},
{
"introduced": "cfb9f07c281effcb0683e8372fd0ee4edda498bf"
},
{
"fixed": "28aa82ae2815988721dd7bbf43cd69c431dcd71b"
},
{
"fixed": "9f76ea445088961f68c364764cc4b7734f368fc0"
},
{
"fixed": "23161ae67d0f064e97c60c4c62b86e94c43a383e"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0.71.1"
},
{
"fixed": "1.50.6"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.51.1"
},
{
"fixed": "1.54.8"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:linuxfoundation:backstage:1.51.0:-:*:*:*:*:*:*",
"range": [
{
"introduced": "1.51.0-NA"
},
{
"last_affected": "1.51.0-NA"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:linuxfoundation:backstage:1.51.0:next0:*:*:*:*:*:*",
"range": [
{
"introduced": "1.51.0-next0"
},
{
"last_affected": "1.51.0-next0"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:linuxfoundation:backstage:1.51.0:next1:*:*:*:*:*:*",
"range": [
{
"introduced": "1.51.0-next1"
},
{
"last_affected": "1.51.0-next1"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:linuxfoundation:backstage:1.51.0:next2:*:*:*:*:*:*",
"range": [
{
"introduced": "1.51.0-next2"
},
{
"last_affected": "1.51.0-next2"
}
],
"source": "CPE_STRING"
},
{
"cpe": "cpe:2.3:a:linuxfoundation:backstage:1.51.0:next3:*:*:*:*:*:*",
"range": [
{
"introduced": "1.51.0-next3"
},
{
"last_affected": "1.51.0-next3"
}
],
"source": "CPE_STRING"
},
{
"range": [
{
"fixed": "28aa82ae2815988721dd7bbf43cd69c431dcd71b"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "9f76ea445088961f68c364764cc4b7734f368fc0"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "0f1b86f07004a0afc1958281253d5d13bb1e1cc8"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v1.50.6"
},
{
"range": [
{
"fixed": "b565780781014c16ad5673facb953fc24ec4d969"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v1.54.8"
},
{
"range": [
{
"fixed": "23161ae67d0f064e97c60c4c62b86e94c43a383e"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v1.55.0"
}
]
}
}
],
"versions": [
"1.51.0-NA",
"1.51.0-next0",
"1.51.0-next1",
"1.51.0-next2",
"1.51.0-next3",
"v1.54.7",
"v1.55.0-next.2",
"v1.54.6",
"v1.55.0-next.1",
"v1.54.5",
"v1.54.4",
"v1.55.0-next.0",
"v1.54.3",
"v1.54.2",
"v1.54.1",
"v1.54.0",
"v1.54.0-next.3",
"v1.54.0-next.2",
"v1.53.0",
"v1.54.0-next.1",
"v1.54.0-next.0",
"v1.53.0-next.2",
"v1.53.0-next.1",
"v1.52.0",
"v1.53.0-next.0",
"v1.52.0-next.2",
"v1.52.0-next.1",
"v1.51.0",
"v1.52.0-next.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-106455.json"
}
}
],
"modified": "2026-10-28T02:30:28.582400686Z",
"provider": "osv",
"references": [
"https://github.com/backstage/backstage/releases/tag/v1.50.6",
"https://github.com/backstage/backstage/releases/tag/v1.54.8",
"https://github.com/backstage/backstage/releases/tag/v1.55.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106455.json",
"https://github.com/backstage/backstage/security/advisories/GHSA-q38j-6vcm-2f5m",
"https://nvd.nist.gov/vuln/detail/CVE-2026-106455",
"https://github.com/backstage/backstage/commit/28aa82ae2815988721dd7bbf43cd69c431dcd71b",
"https://github.com/backstage/backstage/commit/9f76ea445088961f68c364764cc4b7734f368fc0"
],
"provider_metadata": {
"cwe_ids": [
"CWE-918"
],
"cna_assigner": "GitHub_M",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "0.11.12"
},
{
"fixed": "1.14.7"
},
{
"introduced": "1.15.0"
},
{
"fixed": "1.15.5"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106455.json"
}
},
"related_cves": [
{
"value": "CVE-2026-106455",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 495238,
"published_at": "2026-10-06T20:06:06.505+00:00"
}