CVE-2026-41428

Description

Budibase is an open-source low-code platform. Prior to 3.35.4, the authenticated middleware uses unanchored regular expressions to match public (no-auth) endpoint patterns against ctx.request.url. Since ctx.request.url in Koa includes the query string, an attacker can access any protected endpoint by appending a public endpoint path as a query parameter. For example, POST /api/global/users/search?x=/api/system/status bypasses all authentication because the regex /api/system/status/ matches in the query string portion of the URL. This vulnerability is fixed in 3.35.4.

CVSS v3.1 Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS — Exploit Prediction

0.0007

Probability of exploitation

0.21%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-287 Improper Authentication

Affected Products

Vendor	Product	Versions
budibase	budibase	< 3.35.4

References

Advisories & Patches

https://github.com/Budibase/budibase/security/advisories/GHSA-8783-3wgf-jggf https://github.com/Budibase/budibase/security/advisories/GHSA-8783-3wgf-jggf

Exploits

https://github.com/Budibase/budibase/security/advisories/GHSA-8783-3wgf-jggf https://github.com/Budibase/budibase/security/advisories/GHSA-8783-3wgf-jggf

Frequently Asked Questions

What is CVE-2026-41428? +

Budibase is an open-source low-code platform. Prior to 3.35.4, the authenticated middleware uses unanchored regular expressions to match public (no-auth) endpoint patterns against ctx.request.url. Since ctx.request.url in Koa includes the query string, an attacker can access any protected endpoint by appending a public endpoint path as a query parameter. For example, POST /api/global/users/search?x=/api/system/status bypasses all authentication because the regex /api/system/status/ matches in the query string portion of the URL. This vulnerability is fixed in 3.35.4. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-41428? +

CVE-2026-41428 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0007, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-41428? +

CVE-2026-41428 affects products from budibase, specifically: budibase. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-41428? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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