CVE-2026-106459

highpriority · track · 0EPSS 0.002 · 11 %ileUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

0.21% (11th) EPSS

CVSS 8.5 · high

Is it mine?

3 products

Check your exposure

Who says so?

2 sources

nvd · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

8.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.18.5highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:Nsecondary · security-advisories@github.comexploitability 3.1 · impact 4.7

v3.18.5highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:Nsecondary · OSV

v3.17.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-200USCWE-200USCWE-918USCWE-918US

affected products (3)

Products and version ranges known to be affected.

linuxfoundation backstage1.47.0 → 1.54.8nvdUScpe:2.3:a:linuxfoundation:backstage:*:*:*:*:*:*:*:*
linuxfoundation backstage/plugin-scaffolder-backend-module-sentry0.3.0 → 0.3.8nvdUScpe:2.3:a:linuxfoundation:backstage\/plugin-scaffolder-backend-module-sentry:*:*:*:*:*:*:*:*
npm @backstage/plugin-scaffolder-backend-module-sentry0.3.0 → 0.3.8osvUSpkg:npm/%40backstage/plugin-scaffolder-backend-module-sentry

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-g734-fhp4-7mfpBackstage: Improper input validation in Sentry scaffolder actions2026-10-07ghsa · osvUS
### Impact 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. ### Patches Upgrade `@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). The update removes custom action-level `apiBaseUrl` values. Move any such value to `scaffolder.sentry.apiBaseUrl` before upgrading. ### Workarounds - Disable the affected actions until the patched package is deployed. - Restrict `scaffolder.action.execute` permission for the affected Sentry actions to trusted users and templates.

sources

Which sources assert this record, and when.

nvd osv NVD CVE.org MITRE

published 2026-10-06modified 2026-10-13

references (4) nvd

External citations — patches, advisories, analysis.

https://github.com/backstage/backstage/commit/b0170fad7962fb8c3d71366b5265cf283c7bbcf7Patch
https://github.com/backstage/backstage/releases/tag/v1.54.8PatchProduct
https://github.com/backstage/backstage/releases/tag/v1.55.0PatchProduct
https://github.com/backstage/backstage/security/advisories/GHSA-g734-fhp4-7mfpMitigationVendor Advisory

scry

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