Vulnerabilities in pkg:npm/@backstage/plugin-scaffolder-backend-module-sentry
PACKAGECVE-2026-106459 is a HIGH (CVSS 8.5) improper input validation vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Backstage libraries in the npm ecosystem. The issue involves improper input validation in sentry scaffolder actions. Remediation is available by upgrading affected packages to version 0.3.8.
pkg:npm/@backstage/plugin-scaffolder-backend-module-sentry
Vulnerability advisories affecting package pkg:npm/@backstage/plugin-scaffolder-backend-module-sentry. Select an advisory below to view technical details or fixes.
| Advisory ID | CVE / NVD | Severity | Summary |
|---|---|---|---|
| GHSA-g734-fhp4-7mfp | CVE-2026-106459 | HIGH | Backstage: Improper input validation in Sentry scaffolder actions |
CVE-2026-106459 at a Glance
Security Impact
CVSS: 8.5
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N).
How to Fix CVE-2026-106459
To remediate this vulnerability, upgrade all affected Backstage dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
npm install @backstage/plugin-scaffolder-backend-module-sentry@0.3.8Run the following command in your project directory to verify that all resolved dependencies use the patched release:
npm ls @backstage/plugin-scaffolder-backend-module-sentryHow to Check if You Are Affected
To determine whether your Node.js application is affected by CVE-2026-106459, inspect your project dependencies using npm:
npm ls @backstage/plugin-scaffolder-backend-module-sentryAnalyze the terminal output to locate any version of Backstage in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.3.8), your application is affected.
Note: The npm ls @backstage/plugin-scaffolder-backend-module-sentry command inspects dependencies declared in your package.json and lockfile; it does not perform automated runtime dynamic scanning.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Backstage, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2026-106459 Affected Backstage Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
@backstage/plugin-scaffolder-backend-module-sentry
|
npm |
≥ 0.3.0
< 0.3.8
|
0.3.8
|
References
Frequently Asked Questions
What is CVE-2026-106459?
Which Backstage versions are affected?
What version fixes CVE-2026-106459?
Is @backstage/plugin-scaffolder-backend-module-sentry affected?
What is the CVSS score of CVE-2026-106459?
What CWE is associated with CVE-2026-106459?
How can I check npm dependencies for CVE-2026-106459?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-g734-fhp4-7mfp",
"modified" : "2026-10-07T20:25:01Z",
"published" : "2026-10-07T20:25:01Z",
"aliases" : [ "CVE-2026-106459" ],
"summary" : "Backstage: Improper input validation in Sentry scaffolder actions",
"details" : "### Impact\n\nAn 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.\n\n### Patches\n\nUpgrade `@backstage/plugin-scaffolder-backend-module-sentry` to version `0.3.8` or later. The fixed package is available in [Backstage v1.54.8](https://github.com/backstage/backstage/releases/tag/v1.54.8) and [Backstage v1.55.0](https://github.com/backstage/backstage/releases/tag/v1.55.0).\n\nThe update removes custom action-level `apiBaseUrl` values. Move any such value to `scaffolder.sentry.apiBaseUrl` before upgrading.\n\n### Workarounds\n\n- Disable the affected actions until the patched package is deployed.\n- Restrict `scaffolder.action.execute` permission for the affected Sentry actions to trusted users and templates.",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "npm",
"name" : "@backstage/plugin-scaffolder-backend-module-sentry"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0.3.0"
}, {
"fixed" : "0.3.8"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/backstage/backstage/security/advisories/GHSA-g734-fhp4-7mfp"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-106459"
}, {
"type" : "WEB",
"url" : "https://github.com/backstage/backstage/commit/b0170fad7962fb8c3d71366b5265cf283c7bbcf7"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/backstage/backstage"
}, {
"type" : "WEB",
"url" : "https://github.com/backstage/backstage/releases/tag/v1.54.8"
}, {
"type" : "WEB",
"url" : "https://github.com/backstage/backstage/releases/tag/v1.55.0"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-200", "CWE-918" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-10-07T20:25:01Z",
"nvd_published_at" : "2026-10-06T21:17:16Z"
}
}