Vulnerability · Published Oct 6, 2026 · Assigned by GitHub_M
CVE-2026-106459Backstage: Improper input validation in Sentry scaffolder actions
High 8.5
In plain English
A high-severity information exposure in backstage from backstage. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | @backstage/plugin-scaffolder-backend-module-sentry | 0.3.8 | GHSA-g734-fhp4-7mfp |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| backstage | backstage | >= 1.47.0, < 1.54.8 |
| @backstage | plugin-scaffolder-backend-module-sentry | >= 0.3.0, < 0.3.8 |
Weakness: CWE-200, CWE-918 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N
References
- https://github.com/backstage/backstage/security/advisories/GHSA-g734-fhp4-7mfp x_refsource_CONFIRM
- https://github.com/backstage/backstage/commit/b0170fad7962fb8c3d71366b5265cf283c7bbcf7 x_refsource_MISC
- https://github.com/backstage/backstage/releases/tag/v1.54.8 x_refsource_MISC
- https://github.com/backstage/backstage/releases/tag/v1.55.0 x_refsource_MISC