CVE-2026-106456
MediumCVSS 4.8Exploitation Probability (EPSS)
Low risk13th percentile - higher than 13% of all known CVEs
Summary
In @backstage/plugin-proxy-backend from 0.5.0 to 0.6.18, inconsistent credential enforcement for overlapping proxy routes allows an unauthenticated caller to reach a nested upstream. Fixed in version 0.6.18.
Risk Assessment
Risk of unauthorized access to internal services through the proxy, potentially leading to data exposure or unauthorized operations.
Recommendation
Upgrade @backstage/plugin-proxy-backend to version 0.6.18 or later and review proxy route configuration to avoid overlaps.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS