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CVE-2026-50136

Budibase authentication bypass

7.4 HIGHPublic exploitEPSS 0.29%
  1. Published26 Jun 2026

Description

Budibase is an open-source low-code platform. Prior to 3.39.3, the application server exposes an unauthenticated endpoint that generates S3 PutObject presigned URLs using credentials stored in a workspace datasource. The route is protected only by the recaptcha middleware and does not require authentication, table permission, datasource permission, or builder access. A public caller who knows a workspace ID and S3 datasource ID can request a signed upload URL for attacker-controlled bucket and key values. This vulnerability is fixed in 3.39.3.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeChanged
ConfidentialityLow
IntegrityLow
AvailabilityLow
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L

Affected products

Budibase< 3.39.3

Remediation

Fixed in
Budibase≥ 3.39.3

References

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Frequently asked

Is CVE-2026-50136 being actively exploited?

CVE-2026-50136 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.29%.

How severe is CVE-2026-50136?

CVE-2026-50136 has a CVSS 3.1 base score of 7.4, rated high. EPSS estimates a 0.29% probability of exploitation.

Which products are affected by CVE-2026-50136?

Affected products include Budibase.

How do I fix CVE-2026-50136?

Upgrade affected software to a fixed version, for example Budibase 3.39.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-50136 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.