Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder task logs. An authenticated user who can create and read scaffolder tasks may be able to observe sensitive values in task logs in deployments with restrictive action permissions and affected templates. Exploitation requires a denied action whose input contains such a value. This issue is fixed in version 4.1.0.
PUBLISHED5.2CWE-532
Backstage: Sensitive information exposure in scaffolder task logs
Problem type
Affected products
backstage
backstage
< 1.54.6 - AFFECTED
@backstage
plugin-scaffolder-backend
< 4.1.0 - AFFECTED
References
https://github.com/backstage/backstage/security/advisories/GHSA-4xvq-3m68-h444
https://github.com/backstage/backstage/security/advisories/GHSA-4xvq-3m68-h444
https://github.com/backstage/backstage/commit/3eb3dc59eb0da0deccd532f19eb460bb452c9efb
https://github.com/backstage/backstage/commit/3eb3dc59eb0da0deccd532f19eb460bb452c9efb
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-2026-106504Click to expand
{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-106504",
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"assignerShortName": "GitHub_M",
"dateUpdated": "2026-10-06T21:40:15.510Z",
"dateReserved": "2026-10-06T18:46:47.766Z",
"datePublished": "2026-10-06T21:40:15.510Z",
"state": "PUBLISHED"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M",
"dateUpdated": "2026-10-06T21:40:15.510Z"
},
"title": "Backstage: Sensitive information exposure in scaffolder task logs",
"descriptions": [
{
"lang": "en",
"value": "Backstage is an open framework for building developer portals. Prior to 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder task logs. An authenticated user who can create and read scaffolder tasks may be able to observe sensitive values in task logs in deployments with restrictive action permissions and affected templates. Exploitation requires a denied action whose input contains such a value. This issue is fixed in version 4.1.0."
}
],
"affected": [
{
"vendor": "backstage",
"product": "backstage",
"versions": [
{
"version": "< 1.54.6",
"status": "affected"
}
]
},
{
"vendor": "@backstage",
"product": "plugin-scaffolder-backend",
"versions": [
{
"version": "< 4.1.0",
"status": "affected"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"description": "CWE-532: Insertion of Sensitive Information into Log File",
"cweId": "CWE-532",
"type": "CWE"
}
]
}
],
"references": [
{
"url": "https://github.com/backstage/backstage/security/advisories/GHSA-4xvq-3m68-h444",
"name": "https://github.com/backstage/backstage/security/advisories/GHSA-4xvq-3m68-h444",
"tags": [
"x_refsource_CONFIRM"
]
},
{
"url": "https://github.com/backstage/backstage/commit/3eb3dc59eb0da0deccd532f19eb460bb452c9efb",
"name": "https://github.com/backstage/backstage/commit/3eb3dc59eb0da0deccd532f19eb460bb452c9efb",
"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:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"availabilityImpact": "NONE",
"baseScore": 6.5,
"baseSeverity": "MEDIUM"
}
}
]
}
}
}