Budibase is a low code platform for creating internal tools, workflows, and admin panels. In 3.31.4 and earlier, the Budibase server's authorized() middleware that protects every server-side API endpoint can be completely bypassed by appending a webhook path pattern to the query string of any request. The isWebhookEndpoint() function uses an unanchored regex that tests against ctx.request.url, which in Koa includes the full URL with query parameters. When the regex matches, the authorized() middleware immediately calls return next(), skipping all authentication, authorization, role checks, and CSRF protection. This means a completely unauthenticated, remote attacker can access any server-side API endpoint by simply appending ?/webhooks/trigger (or any webhook pattern variant) to the URL.
CVE-2026-31816
This critical-severity CVE scores 9.1 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
- High severity, but no confirmed exploitation yet
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 9.1
- EG Score
- 9.1(low)
- EG Risk
- 72(Attend)EG Risk 72/100SSVC: Attend
EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).
How it’s computedSeverity91% × 45%Exploitation40% × 40%Automatability100% × 15%Action: Remediate soon — notable exploitation risk. - EPSS PROB
- 15%
- EPSS %ILE
- 96%
- KEV
- Not listed
Published
March 9, 2026
Last Modified
June 17, 2026
Advisory Details (1)
Auto-updated Jul 27, 2026Universal Auth Bypass via Webhook Query Param Injection · Advisory · Budibase/budibase · GitHub
https://github.com/Budibase/budibase/security/advisories/GHSA-gw94-hprh-4wj8Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 2× in last 7d / 2× in last 30d)
Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.
- 2026-07-27 12:54 UTCEG score recompute
- 2026-07-27 12:50 UTCOSV refresh
Publicly available exploits
(1 reference)Working exploit code is in the public domain. Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.
- Nucleihttp/cves/2026/CVE-2026-31816.yamlFirst seen Jan 1, 2026
Budibase - Authentication Bypass
Open source ↗
Frequently asked(5)
What is CVE-2026-31816?
When was CVE-2026-31816 disclosed?
Is CVE-2026-31816 actively exploited?
What is the CVSS score of CVE-2026-31816?
How do I remediate CVE-2026-31816?
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-31816
Is Your Infrastructure Affected by CVE-2026-31816?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.