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Back to active CVEs
Medium · CVSS 4.8CVE-2026-106456

Backstage: Inconsistent credential enforcement for overlapping proxy routesCVE-2026-106456

Answer in brief

CVE-2026-106456 records a Medium severity (CVSS 4.8) vulnerability in Backstage: Inconsistent credential enforcement for overlapping proxy routes. The current sources do not mark it as known exploited. The current feed maps backstage/backstage (generic), @backstage/plugin-proxy-backend (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 6, 2026Updated Oct 6, 2026Source checked Oct 7, 2026First seen by HOL Oct 6, 2026Material review Oct 6, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 4.8
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 4.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps backstage/backstage (generic), @backstage/plugin-proxy-backend (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
backstage/backstagegeneric>=1.28.0 <1.55.01.55.0
@backstage/plugin-proxy-backendgeneric>=0.5.0 <0.6.180.6.18

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for backstage/backstage, @backstage/plugin-proxy-backend.
  2. 2Review the reported fix. Update backstage/backstage to 1.55.0; @backstage/plugin-proxy-backend to 0.6.18 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 6, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 6, 2026

Sources and claim methodology

  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
  • GitHub security advisorygithub.com
Upstream source description

Backstage is an open framework for building developer portals. From 0.5.0 until 0.6.18, the @backstage/plugin-proxy-backend package is affected by inconsistent credential enforcement for overlapping proxy routes. An operator can configure overlapping proxy paths with different credential requirements. When a parent path permits unauthenticated access and a nested path requires credentials, the parent exemption can also cover requests handled by the nested proxy. An unauthenticated caller may therefore reach the nested upstream through Backstage, including with static upstream credentials configured for that proxy. This issue is fixed in version 0.6.18.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Backstage: Cloud storage catalog locations may cross configured storage boundariesSame backstage/backstage package
  • Backstage: Improper input validation in cloud storage URL readersSame backstage/backstage package
  • Backstage: Inconsistent enforcement of allowed location types during catalog processingSame backstage/backstage package
  • Backstage: Inconsistent catalog property permission evaluationSame backstage/backstage package
  • Backstage: Improper URL validation in catalog entity placeholder resolutionSame backstage/backstage package
  • Backstage: Secret-derived values may be exposed in scaffolder task logsSame backstage/backstage package

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-863
Source
CVE List V5
Source checked
Oct 7, 2026
References
3 linked sources
Open source record