{"items":[{"id":"NVI-00013844","kind":"vulnerability","title":"nextcloud-mcp-server: Unauthenticated `POST /webhooks/nextcloud` allows arbitrary vector data deletion when `WEBHOOK_SECRET` is unset ( default )","revision":2,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-8vh3-g2qg-2h2c","CVE-2026-55640"],"plain_summary":"GitHub lists this reviewed advisory for nextcloud-mcp-server. 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-126ac136e7861b03a2f889dd6259074c"],"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":"2026-08-25T16:04:17.000Z","value":"9.1 critical","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-0ea232fc815b753f20a60f401890e605"},{"kind":"EPSS","as_of":"2026-11-02T12:00:30.000Z","value":"0.730%","meaning":"FIRST EPSS model v2026.06.15; exploitation probability over 30 days, percentile 0.54279. Missing scores are unknown.","source_id":"sr-126ac136e7861b03a2f889dd6259074c"}],"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-0ea232fc815b753f20a60f401890e605","url":"https://github.com/advisories/GHSA-8vh3-g2qg-2h2c","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-8vh3-g2qg-2h2c","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T09:56:37.775Z"},{"id":"sr-126ac136e7861b03a2f889dd6259074c","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-2026-55640","publisher":"FIRST EPSS","observed_at":"2026-11-02T20:15:58.858Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0ea232fc815b753f20a60f401890e605"],"technology":"nextcloud-mcp-server","known_exclusions":[],"conditions_summary":"## Summary\nThe `POST /webhooks/nextcloud` endpoint has no authentication by default: `WEBHOOK_SECRET` defaults to `None` and is never required by startup validation. When unset, the receiver accepts any unauthenticated POST. The `user_id` is taken directly from the attacker-supplied payload and passed to Qdrant, allowing an unauthenticated attacker to delete or corrupt vector embeddings for any user.\n\n## Details\n**Vulnerable file:** `nextcloud_mcp_server/vector/webhook_receiver.py`, function `handle_nextcloud_webhook()`, **lines 55-67**\n\n**Root cause 1**: Auth check is guarded by `if secret`: - skipped entirely when `WEBHOOK_SECRET` is unset.\n\n**Root cause 2**: `webhook_secret: str | None = None` in config - no startup validator enforces it, even when vector sync is enabled.\n\n**Trusted field**: `payload[\"user\"][\"uid\"]` in `webhook_parser.py` is used as-is for all Qdrant operations - no cross-check against an authenticated session.\n\n`webhook_receiver.py`, **lines 55-67**:\n```python\nsecret = get_settings().webhook_secret  # None by default\nif secret:                           # skipped entirely when unset\n    ... validate Bearer header ...\nelse:\n    _warn_missing_secret_once()     # ","public_affected_ranges":["<= 0.117.1"]}],"null_published_at":"2026-11-04T10:04:47.611Z","source_updated_at":"2026-08-25T16:04:17.000Z","source_disclosed_at":"2026-08-25T16:04:15.000Z","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":"2026-11-02T09:56:37.775Z"},{"id":"NVI-00013844","kind":"vulnerability","title":"nextcloud-mcp-server: Unauthenticated `POST /webhooks/nextcloud` allows arbitrary vector data deletion when `WEBHOOK_SECRET` is unset ( default )","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-8vh3-g2qg-2h2c","CVE-2026-55640"],"plain_summary":"GitHub lists this reviewed advisory for nextcloud-mcp-server. 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-0ea232fc815b753f20a60f401890e605"],"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":"2026-08-25T16:04:17.000Z","value":"9.1 critical","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-0ea232fc815b753f20a60f401890e605"}],"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-0ea232fc815b753f20a60f401890e605","url":"https://github.com/advisories/GHSA-8vh3-g2qg-2h2c","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-8vh3-g2qg-2h2c","publisher":"GitHub Advisory Database","observed_at":"2026-11-02T09:56:37.775Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-0ea232fc815b753f20a60f401890e605"],"technology":"nextcloud-mcp-server","known_exclusions":[],"conditions_summary":"## Summary\nThe `POST /webhooks/nextcloud` endpoint has no authentication by default: `WEBHOOK_SECRET` defaults to `None` and is never required by startup validation. When unset, the receiver accepts any unauthenticated POST. The `user_id` is taken directly from the attacker-supplied payload and passed to Qdrant, allowing an unauthenticated attacker to delete or corrupt vector embeddings for any user.\n\n## Details\n**Vulnerable file:** `nextcloud_mcp_server/vector/webhook_receiver.py`, function `handle_nextcloud_webhook()`, **lines 55-67**\n\n**Root cause 1**: Auth check is guarded by `if secret`: - skipped entirely when `WEBHOOK_SECRET` is unset.\n\n**Root cause 2**: `webhook_secret: str | None = None` in config - no startup validator enforces it, even when vector sync is enabled.\n\n**Trusted field**: `payload[\"user\"][\"uid\"]` in `webhook_parser.py` is used as-is for all Qdrant operations - no cross-check against an authenticated session.\n\n`webhook_receiver.py`, **lines 55-67**:\n```python\nsecret = get_settings().webhook_secret  # None by default\nif secret:                           # skipped entirely when unset\n    ... validate Bearer header ...\nelse:\n    _warn_missing_secret_once()     # ","public_affected_ranges":["<= 0.117.1"]}],"null_published_at":"2026-11-02T10:00:37.158Z","source_updated_at":"2026-08-25T16:04:17.000Z","source_disclosed_at":"2026-08-25T16:04:15.000Z","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":"2026-11-02T09:56:37.775Z"}],"next_cursor":null,"snapshot_revision":"42594"}