TI-2026-34138 Aliases CVE-2026-46426 GHSA-82rc-gxrg-v4gf

Budibase: Unrestricted Upload of File with Dangerous Type

HIGH 66CWE-434Published 2026-05-27 · Updated 2026-05-27

Key facts

Attack vector: Network
Privileges required: Low
User interaction: Required
Attack complexity: Low
Impact type: Code execution, Cross-site scripting
Confidentiality · integrity · availability: High · Low · None
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-434 and CWE-79.

Summary

Budibase is an open-source low-code platform. Prior to 3.38.2, the file upload endpoint POST /api/attachments/process does not enforce active-content restrictions for authenticated users. The checks for dangerous file extensions are conditionally wrapped inside if (isPublicUser) or if (isPublicUser || !env.SELF_HOSTED), meaning any authenticated builder can upload executable web content — SVG files with inline <script> tags, HTML pages with JavaScript, .js modules — which are then stored in the object store (MinIO/S3) with their correct MIME types. When the resulting signed URL is opened by any app user, the browser executes the payload. Impact is persistent stored XSS over all application end users. This vulnerability is fixed in 3.38.2.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00175 7th percentileScored 2026-11-07

Fix Fixed budibase (Budibase): 3.38.2budibase (npm): 3.38.2

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Budibase	budibase	before 3.38.2	3.38.2	Patch available	CNA
—	budibase (npm)	before 3.38.2	3.38.2	Patch available	GHSA-82rc-gxrg-v4gf

budibase VendorBudibase Affected before 3.38.2 Fixed in 3.38.2 Patch available CNA
budibase (npm) Vendor— Affected before 3.38.2 Fixed in 3.38.2 Patch available GHSA-82rc-gxrg-v4gf

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPE	Versions	Role	Vendor
cpe:2.3:a:budibase:budibase::::::::	—	—	Budibase

cpe:2.3:a:budibase:budibase:*:*:*:*:*:*:*:* Versions — — ·Budibase

Remediation

Fix · CNA budibase (Budibase) Fixed in 3.38.2
Fix · GHSA-82rc-gxrg-v4gf budibase (npm) Fixed in 3.38.2 Advisory →

Timeline

2026-10-02 Threatist record created from CVE-2026-46426
2026-10-03 Alias added: GHSA-82rc-gxrg-v4gf

References

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-46426

Other 3

TI-2026-39242 Budibase: Anonymous NoSQL operator injection via published-app query templates CVSS 3.1CRITICAL 10.0
TI-2026-51076 Budibase before 3.40.0 SQL Injection via Unauthenticated Webhook CVSS 4.0CRITICAL 9.0
TI-2026-24369 Budibase Universal Auth Bypass via Webhook Query Param Injection CVSS 3.1CRITICAL 9.1
TI-2026-56709 Budibase before 3.41.3 Remote Code Execution via Plugin eval() CVSS 4.0CRITICAL 9.4
TI-2026-51425 Budibase: SQL Injection via `multipleStatements: true` CVSS 3.1CRITICAL 9.6
TI-2026-51075 Budibase before 3.40.0 Arbitrary File Write via Path Traversal CVSS 4.0CRITICAL 9.4

See all 90 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences