CVE-2026-31816

9.1

CRITICAL CVSS 3.1

Budibase Universal Auth Bypass via Webhook Query Param Injection

Overview

Description

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.

Details

INFO

Published Date :

March 9, 2026, 9:16 p.m.

Last Modified :

March 13, 2026, 5:33 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]

Impact

Affected Products

The following products are affected by CVE-2026-31816 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Budibase	budibase

: Total Affected Vendor : 1 | Products : 1

Scoring

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Score	Version	Severity	Vector	Exploitability Score	Impact Score	Source
	CVSS 3.1	CRITICAL				[email protected]

Solution

Update Budibase to a version that includes the fix for webhook bypass vulnerability.

Update Budibase server to the latest version.
Ensure webhook endpoints are properly secured.
Remove unanchored regex from webhook checks.

Public PoC/Exploit Available at Github

CVE-2026-31816 has a 5 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-31816.

URL	Resource
https://github.com/Budibase/budibase/security/advisories/GHSA-gw94-hprh-4wj8	Exploit Vendor Advisory
https://github.com/Budibase/budibase/security/advisories/GHSA-gw94-hprh-4wj8	Exploit Vendor Advisory

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-31816 is associated with the following CWEs:

CWE-74: Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-31816 weaknesses.

CAPEC-3: Using Leading 'Ghost' Character Sequences to Bypass Input Filters Using Leading 'Ghost' Character Sequences to Bypass Input Filters CAPEC-6: Argument Injection Argument Injection CAPEC-7: Blind SQL Injection Blind SQL Injection CAPEC-8: Buffer Overflow in an API Call Buffer Overflow in an API Call CAPEC-9: Buffer Overflow in Local Command-Line Utilities Buffer Overflow in Local Command-Line Utilities CAPEC-10: Buffer Overflow via Environment Variables Buffer Overflow via Environment Variables CAPEC-13: Subverting Environment Variable Values Subverting Environment Variable Values CAPEC-14: Client-side Injection-induced Buffer Overflow Client-side Injection-induced Buffer Overflow CAPEC-24: Filter Failure through Buffer Overflow Filter Failure through Buffer Overflow CAPEC-28: Fuzzing Fuzzing CAPEC-34: HTTP Response Splitting HTTP Response Splitting CAPEC-42: MIME Conversion MIME Conversion CAPEC-43: Exploiting Multiple Input Interpretation Layers Exploiting Multiple Input Interpretation Layers CAPEC-45: Buffer Overflow via Symbolic Links Buffer Overflow via Symbolic Links CAPEC-46: Overflow Variables and Tags Overflow Variables and Tags CAPEC-47: Buffer Overflow via Parameter Expansion Buffer Overflow via Parameter Expansion CAPEC-51: Poison Web Service Registry Poison Web Service Registry CAPEC-52: Embedding NULL Bytes Embedding NULL Bytes CAPEC-53: Postfix, Null Terminate, and Backslash Postfix, Null Terminate, and Backslash CAPEC-64: Using Slashes and URL Encoding Combined to Bypass Validation Logic Using Slashes and URL Encoding Combined to Bypass Validation Logic CAPEC-67: String Format Overflow in syslog() String Format Overflow in syslog() CAPEC-71: Using Unicode Encoding to Bypass Validation Logic Using Unicode Encoding to Bypass Validation Logic CAPEC-72: URL Encoding URL Encoding CAPEC-76: Manipulating Web Input to File System Calls Manipulating Web Input to File System Calls CAPEC-78: Using Escaped Slashes in Alternate Encoding Using Escaped Slashes in Alternate Encoding CAPEC-79: Using Slashes in Alternate Encoding Using Slashes in Alternate Encoding CAPEC-80: Using UTF-8 Encoding to Bypass Validation Logic Using UTF-8 Encoding to Bypass Validation Logic CAPEC-83: XPath Injection XPath Injection CAPEC-84: XQuery Injection XQuery Injection CAPEC-101: Server Side Include (SSI) Injection Server Side Include (SSI) Injection CAPEC-105: HTTP Request Splitting HTTP Request Splitting CAPEC-108: Command Line Execution through SQL Injection Command Line Execution through SQL Injection CAPEC-120: Double Encoding Double Encoding CAPEC-135: Format String Injection Format String Injection CAPEC-250: XML Injection XML Injection CAPEC-267: Leverage Alternate Encoding Leverage Alternate Encoding CAPEC-273: HTTP Response Smuggling HTTP Response Smuggling

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

imjdl/CVE-2026-31816-rshell

CVE-2026-31816 - Budibase Reverse Shell Exploit

Python

Updated: 3 weeks, 3 days ago

0 stars 0 fork 0 watcher

Born at : March 12, 2026, 12:44 p.m. This repo has been linked 1 different CVEs too.

J1ezds/Vulnerability-Wiki-page

这是一个每天同步Vulnerability-Wiki中docs-base中内容的项目

HTML

Updated: 1 week, 5 days ago

8 stars 1 fork 1 watcher

Born at : Sept. 20, 2024, 3:27 a.m. This repo has been linked 280 different CVEs too.

Threekiii/CVE

一个 CVE 漏洞预警知识库，无 exp/poc，部分包含修复方案。A knowledge base of CVE security vulnerability, no PoCs/exploits.

Updated: 2 weeks, 4 days ago

161 stars 23 fork 23 watcher

Born at : Jan. 5, 2023, 2:19 a.m. This repo has been linked 238 different CVEs too.

Threekiii/Awesome-POC

一个漏洞 PoC 知识库。A knowledge base for vulnerability PoCs(Proof of Concept), with 1k+ vulnerabilities.

poc

Dockerfile Java Python

Updated: 2 weeks, 1 day ago

4873 stars 963 fork 963 watcher

Born at : Feb. 20, 2022, 6:43 a.m. This repo has been linked 482 different CVEs too.

nomi-sec/PoC-in-GitHub

📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.

security cve exploit poc vulnerability

Updated: 2 weeks ago

7589 stars 1242 fork 1242 watcher

Born at : Dec. 8, 2019, 1:03 p.m. This repo has been linked 778 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-31816 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-31816 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

Initial Analysis by [email protected]

Mar. 13, 2026

Action	Type	New Value
Added	CPE Configuration	OR cpe:2.3:a:budibase:budibase::::::::* versions up to (including) 3.31.4
Added	Reference Type	GitHub, Inc.: https://github.com/Budibase/budibase/security/advisories/GHSA-gw94-hprh-4wj8 Types: Exploit, Vendor Advisory
Added	Reference Type	CISA-ADP: https://github.com/Budibase/budibase/security/advisories/GHSA-gw94-hprh-4wj8 Types: Exploit, Vendor Advisory

CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0

Mar. 10, 2026

Action	Type	Old Value	New Value
Added	Reference		https://github.com/Budibase/budibase/security/advisories/GHSA-gw94-hprh-4wj8

New CVE Received by [email protected]

Mar. 09, 2026

Action	Type	New Value
Added	Description	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.
Added	CVSS V3.1	AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Added	CWE	CWE-74
Added	Reference	https://github.com/Budibase/budibase/security/advisories/GHSA-gw94-hprh-4wj8

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.