High
Backstage: Configuration bypass in TechDocs mkdocs.yml sanitization
Type: advisorySources: OSV
Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by configuration bypass in techdocs mkdocs.yml sanitization. Insufficient validation of MkDocs configuration during TechDocs generation could allow an authenticated user who can register or modify documentation sources to execute arbitrary commands in the build environment. Impact is limited to resources accessible to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-106556
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 3 Nov 2026, 05:59 UTC · Revision 1
Source evidence
Backstage: Configuration bypass in TechDocs mkdocs.yml sanitization
core-osv · Original sourcePublished 7 Oct 2026, 14:39 UTC
Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by configuration bypass in techdocs mkdocs.yml sanitization. Insufficient validation of MkDocs configuration during TechDocs generation could allow an authenticated user who can register or modify documentation sources to execute arbitrary commands in the build environment. Impact is limited to resources accessible to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.
osv:CVE-2026-106556
Complete source record
{
"id": "5eeea3e8a8da6120bde33cd9197918eab876edaa5f660432ec335e17436297c1",
"url": "https://osv.dev/vulnerability/CVE-2026-106556",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Backstage: Configuration bypass in TechDocs mkdocs.yml sanitization",
"summary": "Backstage is an open framework for building developer portals. Prior to 1.14.6, the @backstage/plugin-techdocs-node package is affected by configuration bypass in techdocs mkdocs.yml sanitization. Insufficient validation of MkDocs configuration during TechDocs generation could allow an authenticated user who can register or modify documentation sources to execute arbitrary commands in the build environment. Impact is limited to resources accessible to the TechDocs backend or build container. This issue is fixed in versions 1.14.6 and 1.15.4.",
"evidence": "osv:CVE-2026-106556",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-106556",
"aliases": [
"CVE-2026-106556",
"GHSA-g2hj-v2j6-vfvg"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:L/A:L"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/backstage/backstage",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "f3e982bd0530f51760c8a70d21eafaa7aed2e6eb"
},
{
"introduced": "d7c94cba92159b2f427a412d72381b294575193f"
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{
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{
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{
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{
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"database_specific": {
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{
"cpe": "cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*",
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{
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"source": "CPE_STRING"
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{
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"source": "CPE_STRING"
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"source": "REFERENCES_COMMIT"
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"source": "REFERENCES_TAG",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-106556.json"
}
}
],
"modified": "2026-10-28T02:30:26.254015640Z",
"provider": "osv",
"references": [
"https://github.com/backstage/backstage/releases/tag/v1.50.5",
"https://github.com/backstage/backstage/releases/tag/v1.54.6",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106556.json",
"https://github.com/backstage/backstage/security/advisories/GHSA-g2hj-v2j6-vfvg",
"https://nvd.nist.gov/vuln/detail/CVE-2026-106556",
"https://github.com/backstage/backstage/commit/25125ee727a3de3418a8fa6a9e458cd5b73ecf26",
"https://github.com/backstage/backstage/commit/b6d1aea0bef99b8dfec3c8746032474867ba677a"
],
"provider_metadata": {
"cwe_ids": [
"CWE-184",
"CWE-78"
],
"cna_assigner": "GitHub_M",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"fixed": "1.14.6"
},
{
"introduced": "1.15.0"
},
{
"fixed": "1.15.4"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106556.json"
}
},
"related_cves": [
{
"value": "CVE-2026-106556",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 492900,
"published_at": "2026-10-07T14:39:36.015+00:00"
}