CVE-2026-106501
Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.48%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Backstage is an open framework for building developer portals. Prior to 3.3.1, 3.4.1, 4.0.3 and 4.1.0, the @backstage/plugin-scaffolder-backend package is affected by sensitive information exposure in scaffolder. An authenticated Backstage user who can read another user's Scaffolder task may receive internal execution data. In deployments where that data contains credentials for an external service, this may permit disclosure and unauthorized changes in that external service. This issue is fixed in versions 3.3.1, 3.4.1, 4.0.3 and 4.1.0.
- CVSS 3.1
- 9.6 CRITICALCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N
- EPSS
- 0.48% probability · 41th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-200, CWE-201
- Affected
- linuxfoundation/backstage\/plugin-scaffolder-backend · linuxfoundation/backstage
- Source
- security-advisories@github.com
EPSS moved from 0.5% on 7 October 2026 to 0.5% on 26 October 2026.
References
- https://github.com/backstage/backstage/commit/66d2219edf0abe33ab7d0c1ced5d069d1e065be5Patch
- https://github.com/backstage/backstage/commit/c19838870476a8e29144c84b1a5ac0654ec20fb5Patch
- https://github.com/backstage/backstage/commit/e262d649981ff99bb01ca7077807ae3e25e85560Patch
- https://github.com/backstage/backstage/releases/tag/v1.49.6Patch, Release Notes
- https://github.com/backstage/backstage/releases/tag/v1.50.5Patch, Release Notes
- https://github.com/backstage/backstage/releases/tag/v1.54.6Patch, Release Notes
- https://github.com/backstage/backstage/security/advisories/GHSA-g2v8-7jhw-pp8pMitigation, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.