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CVE-2026-73409

Vulnerability in @budibase/server (CVE-2026-73409)

Summary

Vulnerability in @budibase/server (CVE-2026-73409). Risk of unauthorized operations or information disclosure. Exploitable via tlsCertificateKeyFile.

Original description

The description as published by the source.

Summary

When creating a MongoDB datasource, Budibase passes the tlsCertificateKeyFile and tlsCAFile fields straight to the MongoDB driver as server-side file paths. On Budibase Cloud a customer cannot place files on the server, so these fields only let a builder reference arbitrary absolute paths on the underlying multi-tenant server. When the datasource is verified, the driver performs a real filesystem read of that path, and the error differs by file state, turning /api/datasources/verify into an arbitrary-path existence/read oracle over the whole server filesystem.

Root Cause

packages/server/src/integrations/mongodb.ts passes config.tlsCertificateKeyFile / config.tlsCAFile directly to new MongoClient(config.connectionString, options) as filesystem paths, with no allow-list, no confinement to a certificates directory, and no rejection of absolute / .. paths.

POC

Reproduction — paste each line, press Enter

Line 1 (existing file — proves the file is READ):

curl -s -X POST "https://hasinocompany.budibase.app/api/datasources/verify" -H "Cookie: budibase:auth=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzZXNzaW9uSWQiOiJlNDYzZTM0Ni1hZmQ2LTQwNDEtODNmMS1hYmNlNzhjMmExN2QiLCJ1c2VySWQiOiJ1c19jMGY4NDE0NjAxYmQ0ZTk0YTJmMTEzMTAxYzVlNzZkNCIsImVtYWlsIjoiY3liZXJAaGFzaW5vc2VjLmxhdCIsImNzcmZUb2tlbiI6ImU5ZDJlZjQ4LTJiNmEtNDJhZC1hN2ViLTY1NzkzZDg3ZDdlYyIsInRlbmFudElkIjoiaGFzaW5vY29tcGFueSIsImlhdCI6MTc4NDAzNTU1NywiZXhwIjoxNzg0NjQwMzU3fQ.oaxPeSwQ571QDd7pPZZy-G0b4rpI6-wYQq…

Source: GitHub Security Advisories (Global) NVD GitHub Advisory

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-73409 has been found in @budibase/server.
Attackers can target a specific entry point like tlsCertificateKeyFile over the network to misuse the product.
Risk of unauthorized operations or information disclosure.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "@budibase/server CVE-2026-73409" on the vendor's site.

CVE-2026-73409 (@budibase/server) — CWE-203
Attack surface: tlsCertificateKeyFile / tlsCAFile / config.tlsCertificateKeyFile / config.tlsCAFile
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-203) exists in @budibase/server. Attackers reach the vulnerable code path via tlsCertificateKeyFile.

📍 Affected scope

Check the vendor advisory for the affected versions of @budibase/server. Attack surface: tlsCertificateKeyFile / tlsCAFile / config.tlsCertificateKeyFile / config.tlsCAFile.

🔥 Severity

Severity: ?. Risk of unauthorized operations or information disclosure.

🔧 How to fix

Update to the patched release per vendor advisory.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r '@budibase/server' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    grep -r '@budibase/server' . | grep -v node_modules

    リポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で @budibase/server を grep し、稼働しているサービス・バージョンを把握する。

  2. 2
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

npm @budibase/server
[{"type":"SEMVER","events":[{"introduced":"0"},{"last_affected":"3.38.1"}]}]

References

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