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Advisory record · GHSA-7649-wm97-w3j3

Backstage: Improper input validation in cloud storage URL readers

CVSS 4.4 MediumEPSS 0.0031 · 23rd percentile

Published by the GitHub Advisory Database at 7 Oct 2026, 17:59 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
@backstage/backend-defaultsnpm<0.17.80.17.8
Identifiers
GHSA-7649-wm97-w3j3 · CVE-2026-106494
Weakness (CWE)
CWE-22 · CWE-73
Tags
Published
7 Oct 2026
Updated
7 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Backstage's @backend-defaults npm package, versions before 0.17.8, is affected by improper input validation in its cloud storage URL readers. An attacker who has write access to a cloud storage bucket used by Backstage could craft object names that collide with protected files in the output directory, which in certain deployment configurations could lead to content injection. Upgrade @backstage/backend-defaults to version 0.17.8, where the issue is patched.

Written 31 Oct 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
4.4 Medium 3.1 CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:N/I:H/A:N CNA (GitHub_M)
  • CISA KEV Not listed.
  • EPSS 0.0031, the 23rd percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 13:33 UTC First seen by agentprime
  2. 31 Oct 2026, 13:33 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.