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## Summary - harden reopened advisory fixes across REST connector, invoke, document downloads, and markdown rendering - add targeted regression coverage for redirect-safe SSRF handling, invoke SSRF checks, document access control, and markdown sanitization - verify each referenced GHSA against the original GitHub advisory text and align the closed-advisory plan with the implemented remediation ## What changed - add tenant access checks to document download endpoints to avoid cross-tenant document disclosure - add per-hop SSRF validation, DNS pinning, redirect handling, and redirect limits to the REST API connector - ensure invoke requests validate and pin the resolved host and never follow redirects implicitly - keep the generic rate-limited request path wrapped, not just GET and POST helpers - sanitize markdown HTML before rendering in the highlight markdown component ## Validation - `cd web && npm test -- --runInBand src/components/highlight-markdown/__tests__/index.test.tsx` - `.venv/bin/python -m pytest -q test/unit_test/data_source/test_rest_api_connector.py` - targeted `test/testcases/test_web_api/...` unit additions were reviewed, but the suite cannot be executed end-to-end in this environment because parent `test/testcases/conftest.py` requires a local service on `127.0.0.1:9380` ## Notes - all GHSA entries referenced by the plan were checked against the original GitHub advisory text, not sampled - the closed-advisory plan document was updated locally during review, but is intentionally not included in this PR