CVEvulnerability

CVE-2026-106456

6.5 MEDIUM Published 2026-10-06 Modified 2026-10-27 Official page ↗
Status
Analyzed
Published
2026-10-06
Last modified
2026-10-27
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.8 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS 3.1 ([email protected])
6.5 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Weaknesses
CWE-863

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.

Affected configurations

• linuxfoundation backstage\/plugin-proxy-backend (>= 0.5.0 < 0.6.18) • linuxfoundation backstage (>= 1.28.0 < 1.55.0)

Related

Weakness · CWE (1)

  • CWE-863 Incorrect Authorization weakness

References