{"items":[{"id":"NVI-00017738","kind":"vulnerability","title":"Waku: Cross-Origin CSRF on RSC Server Action Dispatch","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-75w3-gmqx-993q","CVE-2026-49455"],"plain_summary":"GitHub lists this reviewed advisory for waku. 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-5501b5823f9c661ac4d6bb8e40e6961b"],"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":"2026-07-08T20:27:12.000Z","value":"6.5 medium","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-5501b5823f9c661ac4d6bb8e40e6961b"}],"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-5501b5823f9c661ac4d6bb8e40e6961b","url":"https://github.com/advisories/GHSA-75w3-gmqx-993q","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-75w3-gmqx-993q","publisher":"GitHub Advisory Database","observed_at":"2026-11-04T23:34:40.400Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-5501b5823f9c661ac4d6bb8e40e6961b"],"technology":"waku","known_exclusions":[],"conditions_summary":"## Summary\n\nWaku's RSC request dispatcher invokes server actions without validating the request's `Origin` (or `Sec-Fetch-Site`) header. A cross-origin web attacker can therefore cause a victim browser to issue an authenticated `POST` to a registered server action endpoint using a CORS-safelisted content type (`text/plain`), which does not trigger a preflight. Any state-mutating server action that the application exposes via `'use server'` can be invoked with the victim's cookies attached. A working proof-of-concept demonstrates the vulnerability against waku 1.0.0-beta.0 dev server: a cross-origin POST with `Content-Type: text/plain` invokes a registered `'use server'` action and returns HTTP 200 with an RSC stream response. The same defect affects the progressive-enhancement (no-JavaScript) server action path: a cross-origin HTML form auto-submitting `multipart/form-data` reaches the dispatch through a second unguarded branch of the request handler, dynamically confirmed on 2026-05-17. Both branches were confirmed exploitable from opaque-origin contexts (sandboxed iframes, `file://` navigation, browser extension pages), which send `Origin: null` — a value no Origin guard exists t","public_affected_ranges":["<= 1.0.0-beta.0"]}],"null_published_at":"2026-11-05T19:10:21.459Z","source_updated_at":"2026-07-08T20:27:12.000Z","source_disclosed_at":"2026-07-08T20:27:11.000Z","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":"2026-11-04T23:34:40.400Z"}],"next_cursor":null,"snapshot_revision":"42594"}