CVE-2026-106459 json
Backstage: Improper input validation in Sentry scaffolder actions
published 2026-10-06 33 d ago modified 2026-10-13 27 d ago also GHSA-g734-fhp4-7mfp , EUVD-2026-93993
- cvss
- 8.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 11%
- public exploits
- 0
- none known
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.
Patch / fix
- npm @backstage/plugin-scaffolder-backend-module-sentry 0.3.8
- linuxfoundation backstage/plugin-scaffolder-backend-module-sentry 0.3.8
- linuxfoundation backstage 1.54.8
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 33 d ago
Exploit prediction
0.21% chance of exploitation in the next 30 days, higher than 11% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N |
| GitHub | 3.1 | 8.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | @backstage/plugin-scaffolder-backend-module-sentry | >=0.3.0, <0.3.8 |
0.3.8 |
Affected products
- backstage backstage
- @backstage plugin-scaffolder-backend-module-sentry
Classification
References
-
github.com
/backstage/backstage/commit/b0170fad7962fb8c3d71366b5265cf283c7bbcf7
web, patch
-
github.com
/backstage/backstage/releases/tag/v1.54.8
web, patch, product
-
github.com
/backstage/backstage/releases/tag/v1.55.0
web, patch, product
-
github.com
/backstage/backstage/security/advisories/GHSA-g734-fhp4-7mfp
web, mitigation, vendor-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2026-106459
advisory
-
github.com
/backstage/backstage
package
Sources
- CVE List CVE-2026-106459
- GitHub Advisory GHSA-g734-fhp4-7mfp
- NVD CVE-2026-106459
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