PT-2026-42050 · Budibase · Budibase

Da7Om85 · Published 2026-05-19 · Updated 2026-05-27 · CVE-2026-46426

Positive Technologies (AI Summary)

CVSS v3.1

7.6

High

Base vector

AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:L/A:N

Name of the Vulnerable Software and Affected Versions Budibase versions prior to 3.38.2

Description The file upload endpoint "/api/attachments/process" does not enforce active-content restrictions for authenticated users. The system fails to properly check for dangerous file extensions when the user is not a public user or when the environment is self-hosted. This allows authenticated builders to upload executable web content, such as SVG files containing inline <script> tags, HTML pages with JavaScript, or .js modules. These files are stored in the object store with their original MIME types. When a signed URL to the uploaded file is opened by any application user, the browser executes the payload, resulting in persistent stored Cross-Site Scripting (XSS). The issue is located within the uploadFile() function.

Recommendations Update to version 3.38.2. As a temporary workaround, restrict access to the "/api/attachments/process" endpoint to minimize the risk of exploitation.

Exploit

Fix

XSS

Unrestricted File Upload

Weakness Enumeration

CWE-79

CWE-434

Related Identifiers

CVE-2026-46426

GHSA-82RC-GXRG-V4GF

Affected Products

Budibase

References · 7

• 🔥 https://github.com/Budibase/budibase/security/advisories/GHSA-82rc-gxrg-v4gf · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-46426 · Security Note
• https://osv.dev/vulnerability/GHSA-82rc-gxrg-v4gf · Vendor Advisory
• https://github.com/Budibase/budibase · Note
• https://github.com/Budibase/budibase/releases/tag/3.38.2 · Note
• https://twitter.com/infoflowcloud/status/2059719046753296571 · Twitter Post
• https://twitter.com/CVEnew/status/2059718136568688892 · Twitter Post