{"items":[{"id":"NVI-00012069","kind":"vulnerability","title":"Backstage: Inconsistent credential enforcement for overlapping proxy routes","revision":3,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-472h-9c5j-prrr","CVE-2026-106456"],"plain_summary":"GitHub lists this reviewed advisory for @backstage/plugin-proxy-backend. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-0a1cab2b4cd112ac8ba6393ef93c061b"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-07T20:25:13.000Z","value":"4.8 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-9d08c459e368b928fad51ae920074768"},{"kind":"EPSS","as_of":"2026-11-02T12:00:30.000Z","value":"0.239%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.14997. Missing scores are unknown.","source_id":"sr-0a1cab2b4cd112ac8ba6393ef93c061b"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-9d08c459e368b928fad51ae920074768","url":"https://github.com/advisories/GHSA-472h-9c5j-prrr","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-472h-9c5j-prrr","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T00:58:46.232Z"},{"id":"sr-0a1cab2b4cd112ac8ba6393ef93c061b","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-106456","publisher":"FIRST EPSS","observed_at":"2026-11-02T20:15:58.839Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-9d08c459e368b928fad51ae920074768"],"technology":"@backstage/plugin-proxy-backend","known_exclusions":[],"conditions_summary":"### Impact\n\nAn 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.\n\nExploitation requires this specific overlapping route configuration. The resulting confidentiality and integrity impact depends on the capabilities exposed by the nested upstream.\n\n### Patches\n\nUpgrade `@backstage/plugin-proxy-backend` to version `0.6.18` or later. The fixed package is available in Backstage v1.55.0.\n\n### Workarounds\n\n- Avoid nesting a credential-protected proxy path below a path configured with `dangerously-allow-unauthenticated`.\n- Apply the same credential requirement to overlapping proxy paths.\n- Restrict direct network access to the Backstage backend until the patched package is deployed.","public_affected_ranges":[">= 0.5.0, < 0.6.18"]}],"null_published_at":"2026-11-03T17:49:15.034Z","source_updated_at":"2026-10-07T20:25:13.000Z","source_disclosed_at":"2026-10-07T20:25:13.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-11-01T00:58:46.232Z"},{"id":"NVI-00012069","kind":"vulnerability","title":"Backstage: Inconsistent credential enforcement for overlapping proxy routes","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-472h-9c5j-prrr","CVE-2026-106456"],"plain_summary":"GitHub lists this reviewed advisory for @backstage/plugin-proxy-backend. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-7bce1e2f2b8623b77273ae8e36f4a7b8"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-07T20:25:13.000Z","value":"4.8 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-9d08c459e368b928fad51ae920074768"},{"kind":"EPSS","as_of":"2026-10-31T12:00:27.000Z","value":"0.239%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.15014. Missing scores are unknown.","source_id":"sr-7bce1e2f2b8623b77273ae8e36f4a7b8"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-9d08c459e368b928fad51ae920074768","url":"https://github.com/advisories/GHSA-472h-9c5j-prrr","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-472h-9c5j-prrr","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T00:58:46.232Z"},{"id":"sr-7bce1e2f2b8623b77273ae8e36f4a7b8","url":"https://www.first.org/epss/data.html","basis":"official_catalog","notes":"FIRST EPSS; probability of exploitation in the next 30 days, not local compromise. Dataset date/model retained; FIRST services terms apply.","title":"CVE-2026-106456","publisher":"FIRST EPSS","observed_at":"2026-11-01T01:39:43.064Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-9d08c459e368b928fad51ae920074768"],"technology":"@backstage/plugin-proxy-backend","known_exclusions":[],"conditions_summary":"### Impact\n\nAn 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.\n\nExploitation requires this specific overlapping route configuration. The resulting confidentiality and integrity impact depends on the capabilities exposed by the nested upstream.\n\n### Patches\n\nUpgrade `@backstage/plugin-proxy-backend` to version `0.6.18` or later. The fixed package is available in Backstage v1.55.0.\n\n### Workarounds\n\n- Avoid nesting a credential-protected proxy path below a path configured with `dangerously-allow-unauthenticated`.\n- Apply the same credential requirement to overlapping proxy paths.\n- Restrict direct network access to the Backstage backend until the patched package is deployed.","public_affected_ranges":[">= 0.5.0, < 0.6.18"]}],"null_published_at":"2026-11-03T10:03:21.816Z","source_updated_at":"2026-10-07T20:25:13.000Z","source_disclosed_at":"2026-10-07T20:25:13.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"Dated EPSS estimate updated; this is not a new disclosure or proof of exploitation.","null_first_observed_at":"2026-11-01T00:58:46.232Z"},{"id":"NVI-00012069","kind":"vulnerability","title":"Backstage: Inconsistent credential enforcement for overlapping proxy routes","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-472h-9c5j-prrr","CVE-2026-106456"],"plain_summary":"GitHub lists this reviewed advisory for @backstage/plugin-proxy-backend. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-9d08c459e368b928fad51ae920074768"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-10-07T20:25:13.000Z","value":"4.8 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-9d08c459e368b928fad51ae920074768"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-9d08c459e368b928fad51ae920074768","url":"https://github.com/advisories/GHSA-472h-9c5j-prrr","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-472h-9c5j-prrr","publisher":"GitHub Advisory Database","observed_at":"2026-11-01T00:58:46.232Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-9d08c459e368b928fad51ae920074768"],"technology":"@backstage/plugin-proxy-backend","known_exclusions":[],"conditions_summary":"### Impact\n\nAn 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.\n\nExploitation requires this specific overlapping route configuration. The resulting confidentiality and integrity impact depends on the capabilities exposed by the nested upstream.\n\n### Patches\n\nUpgrade `@backstage/plugin-proxy-backend` to version `0.6.18` or later. The fixed package is available in Backstage v1.55.0.\n\n### Workarounds\n\n- Avoid nesting a credential-protected proxy path below a path configured with `dangerously-allow-unauthenticated`.\n- Apply the same credential requirement to overlapping proxy paths.\n- Restrict direct network access to the Backstage backend until the patched package is deployed.","public_affected_ranges":[">= 0.5.0, < 0.6.18"]}],"null_published_at":"2026-11-01T01:03:56.628Z","source_updated_at":"2026-10-07T20:25:13.000Z","source_disclosed_at":"2026-10-07T20:25:13.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-01T00:58:46.232Z"}],"next_cursor":null,"snapshot_revision":"42594"}