Vulnerability in @budibase/server (CVE-2026-73306)
Summary
Vulnerability in @budibase/server (CVE-2026-73306). Risk of unauthorized operations or information disclosure. Exploitable via POST /api/global/auth/.
Original description
The description as published by the source.
Summary
The login lockout mechanism in Budibase creates an observable response discrepancy that allows unauthenticated attackers to enumerate valid email addresses. When an existing user's account is locked after 5 failed login attempts, the server returns a distinct 403 response with X-Account-Locked: 1 and Retry-After: 900 headers plus the message "Account temporarily locked." For non-existing users, the response is always a generic 403 "Unauthorized" regardless of attempt count, because the lockout counter is never incremented.
Details
The vulnerability exists in two files that implement the login lockout feature:
packages/worker/src/middleware/lockout.ts:18-36 — The lockout middleware only blocks requests for users that exist in the database AND are locked:
export default async (ctx: Ctx, next: Next) => {
const email = ctx.request.body.username
if (!email) {
return await next()
}
const dbUser = await userSdk.db.getUserByEmail(email)
if (dbUser && (await isLocked(email))) { // line 26: non-existing users skip this entirely
ctx.set("X-Account-Locked", "1")
ctx.set("Retry-After", String(env.LOGIN_LOCKOUT_SECONDS))
ctx.throw(403, "Account temporarily locked. Try again later.")
}
return await next()
}
packages/worker/src/api/controllers/global/auth.ts:127-141 — The login handler only increments the failure counter for existing users:
if (err || !user) {
if (dbUser) { // l…
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-2026-73306 has been found in @budibase/server.
Attackers can target a specific entry point like POST /api/global/auth/ over the network to misuse the product.
Risk of unauthorized operations or information disclosure. CVSS score: 5.3/10.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "@budibase/server CVE-2026-73306" on the vendor's site.
CVE-2026-73306 (@budibase/server) — CWE-204 / CVSS v3 5.3
Attack vector: remote (network-reachable) / unauthenticated / no user interaction
Attack surface: POST /api/global/auth/ / lockout / getUserByEmail / isLocked
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.
A vulnerability (CWE-204) exists in @budibase/server. Attackers reach the vulnerable code path via POST /api/global/auth/ without authentication.
Check the vendor advisory for the affected versions of @budibase/server. Attack surface: POST /api/global/auth/ / lockout / getUserByEmail / isLocked.
Severity: Medium (CVSS 5.3/10). Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual POST /api/global/auth/ requests with malformed payloads or SQL meta-characters. 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
-
1Identify 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。 -
2Hunt for indicators of compromise detect
grep 'POST /api/global/auth/' /var/log/nginx/access.log | grep -E '(unusual_payload|sqli_pattern)'アクセスログで
POST /api/global/auth/への異常なリクエスト (不正な認証ヘッダ・SQLメタ文字)を過去 30〜90日分捜索。WAF/SIEM があれば該当パスのアラート発火履歴を確認。 -
3Post-deployment verification verify
Replay attack against POST /api/global/auth/ on staging to confirm patch closes the vector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 Step 2 と同じログクエリでアラート再発が無いか継続監視。
Affected packages
References
- package github.com
- web github.com
- web github.com
- web github.com
- web github.com
- web github.com