High
Backstage: Improper validation of TechDocs MkDocs configuration
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-106558
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 5 Nov 2026, 03:43 UTC · Revision 1
Source evidence
Backstage: Improper validation of TechDocs MkDocs configuration
core-osv · Original sourcePublished 7 Oct 2026, 14:45 UTC
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.
osv:CVE-2026-106558
Complete source record
{
"id": "61f7828c4f8dd5f1ed8ce1bb3a32011c2e4ecf0f3532db25aa50378c93ccac8d",
"url": "https://osv.dev/vulnerability/CVE-2026-106558",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Backstage: Improper validation of TechDocs MkDocs configuration",
"summary": "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.",
"evidence": "osv:CVE-2026-106558",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-106558",
"aliases": [
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"GHSA-qmw3-745m-w99g"
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"metrics": [
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"type": "CVSS_V3",
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"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-106558.json"
}
}
],
"modified": "2026-10-28T02:30:42.200568374Z",
"provider": "osv",
"references": [
"https://github.com/backstage/backstage/releases/tag/v1.50.7",
"https://github.com/backstage/backstage/releases/tag/v1.54.9",
"https://github.com/backstage/backstage/releases/tag/v1.55.2",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106558.json",
"https://github.com/backstage/backstage/security/advisories/GHSA-qmw3-745m-w99g",
"https://nvd.nist.gov/vuln/detail/CVE-2026-106558",
"https://github.com/backstage/backstage/commit/32723a0fe4e12ed80535fc65d5331765c55aa91b",
"https://github.com/backstage/backstage/commit/944edb51c8524d3664b18f2d57ba101b1c93b709",
"https://github.com/backstage/backstage/commit/f18e9abcc6051491862b15e4fc60e69f8d52310c"
],
"provider_metadata": {
"cwe_ids": [
"CWE-502"
],
"cna_assigner": "GitHub_M",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"fixed": "1.14.8"
},
{
"introduced": "1.15.0"
},
{
"fixed": "1.15.6"
},
{
"introduced": "2.0.0"
},
{
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}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106558.json"
}
},
"related_cves": [
{
"value": "CVE-2026-106558",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 509941,
"published_at": "2026-10-07T14:45:25.679+00:00"
}