CVE-2026-50136

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 v3.1 Score

7.4

HIGH

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

EPSS — Exploit Prediction

0.0029

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-306 Missing Authentication

Affected Products

Vendor	Product	Versions
budibase	budibase	< 3.39.3

References

Advisories & Patches

https://github.com/Budibase/budibase/security/advisories/GHSA-jj36-r9w3-3pfh https://github.com/Budibase/budibase/security/advisories/GHSA-jj36-r9w3-3pfh

Exploits

https://github.com/Budibase/budibase/security/advisories/GHSA-jj36-r9w3-3pfh https://github.com/Budibase/budibase/security/advisories/GHSA-jj36-r9w3-3pfh

Frequently Asked Questions

What is CVE-2026-50136? +

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. It has a CVSS v3.1 base score of 7.4 (HIGH).

How severe is CVE-2026-50136? +

CVE-2026-50136 has a CVSS v3.1 score of 7.4 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0029, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-50136? +

CVE-2026-50136 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-2026-50136? +

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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