Backstage: Improper input validation in Sentry scaffolder actions
Backstage is an open framework for building developer portals. From 0.3.0 until 0.3.8, the @backstage/plugin-scaffolder-backend-module-sentry package is affected by improper input validation in sentry scaffolder actions. An authenticated internal user who can execute the affected actions may cause the backend to contact unintended destinations and disclose Sentry integration credentials. Subsequent impact depends on network reachability and the privileges granted to the configured token. This issue is fixed in version 0.3.8.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-106459
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 23:56 UTC · Revision 1
Source evidence
Backstage: Improper input validation in Sentry scaffolder actions
core-osv · Original sourcePublished 6 Oct 2026, 20:19 UTC
Backstage is an open framework for building developer portals. From 0.3.0 until 0.3.8, the @backstage/plugin-scaffolder-backend-module-sentry package is affected by improper input validation in sentry scaffolder actions. An authenticated internal user who can execute the affected actions may cause the backend to contact unintended destinations and disclose Sentry integration credentials. Subsequent impact depends on network reachability and the privileges granted to the configured token. This issue is fixed in version 0.3.8.
osv:CVE-2026-106459
Complete source record
{
"id": "688da4a271444e617cb67e9454992e14feff8a7287c004fcd5af1829afbe0c0e",
"url": "https://osv.dev/vulnerability/CVE-2026-106459",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Backstage: Improper input validation in Sentry scaffolder actions",
"summary": "Backstage is an open framework for building developer portals. From 0.3.0 until 0.3.8, the @backstage/plugin-scaffolder-backend-module-sentry package is affected by improper input validation in sentry scaffolder actions. An authenticated internal user who can execute the affected actions may cause the backend to contact unintended destinations and disclose Sentry integration credentials. Subsequent impact depends on network reachability and the privileges granted to the configured token. This issue is fixed in version 0.3.8.",
"evidence": "osv:CVE-2026-106459",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-106459",
"aliases": [
"CVE-2026-106459",
"GHSA-g734-fhp4-7mfp"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/backstage/backstage",
"type": "GIT",
"events": [
{
"introduced": "e63a312b0c8d3b1e1333caf3eb5f576e9e59ee63"
},
{
"fixed": "b565780781014c16ad5673facb953fc24ec4d969"
},
{
"fixed": "b0170fad7962fb8c3d71366b5265cf283c7bbcf7"
},
{
"fixed": "23161ae67d0f064e97c60c4c62b86e94c43a383e"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "1.47.0"
},
{
"fixed": "1.54.8"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "b0170fad7962fb8c3d71366b5265cf283c7bbcf7"
}
],
"source": "REFERENCES_COMMIT"
},
{
"range": [
{
"fixed": "b565780781014c16ad5673facb953fc24ec4d969"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v1.54.8"
},
{
"range": [
{
"fixed": "23161ae67d0f064e97c60c4c62b86e94c43a383e"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v1.55.0"
}
]
}
}
],
"versions": [
"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",
"v1.51.0-next.3",
"v1.51.0-next.2",
"v1.51.0-next.1",
"v1.51.0-next.0",
"v1.50.0",
"v1.50.0-next.2",
"v1.50.0-next.1",
"v1.50.0-next.0",
"v1.49.0",
"v1.49.0-next.2",
"v1.49.0-next.1",
"v1.49.0-next.0",
"v1.48.0",
"v1.48.0-next.2",
"v1.48.0-next.1",
"v1.48.0-next.0",
"v1.47.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-106459.json"
}
}
],
"modified": "2026-10-28T02:30:24.577871042Z",
"provider": "osv",
"references": [
"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-2026-106459.json",
"https://github.com/backstage/backstage/security/advisories/GHSA-g734-fhp4-7mfp",
"https://nvd.nist.gov/vuln/detail/CVE-2026-106459",
"https://github.com/backstage/backstage/commit/b0170fad7962fb8c3d71366b5265cf283c7bbcf7"
],
"provider_metadata": {
"cwe_ids": [
"CWE-200",
"CWE-918"
],
"cna_assigner": "GitHub_M",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "0.3.0"
},
{
"fixed": "0.3.8"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StringRangeExpression"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/106xxx/CVE-2026-106459.json"
}
},
"related_cves": [
{
"value": "CVE-2026-106459",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 491004,
"published_at": "2026-10-06T20:19:37.541+00:00"
}