CVE-2026-54353: budibase SSRF — Exploit & Fix

Description

Budibase is an open-source low-code platform. Prior to 3.39.9, authenticated users with automation permissions can bypass Budibase's SSRF blacklist through DNS rebinding. The outbound fetch flow validates a hostname against the blacklist before the request is sent, but the actual socket connection later performs a separate DNS lookup through node-fetch. Since the validated IPs are never pinned to the connection, an attacker-controlled hostname can return a public IP during validation and a private/internal IP during the real connection. This results in a non-blind SSRF primitive against internal services reachable from the Budibase host, including loopback, RFC1918 ranges, and cloud metadata endpoints. This vulnerability is fixed in 3.39.9.

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CVSS v3.1 Score

8.5

HIGH

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

EPSS — Exploit Prediction

0.0020

Probability of exploitation

0.10%

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-367 CWE-367

CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

Vendor	Product	Versions
budibase	budibase	< 3.39.9

References

Advisories & Patches

https://github.com/Budibase/budibase/security/advisories/GHSA-gfq7-5x4g-3xhf https://github.com/Budibase/budibase/security/advisories/GHSA-gfq7-5x4g-3xhf

Exploits

https://github.com/Budibase/budibase/security/advisories/GHSA-gfq7-5x4g-3xhf https://github.com/Budibase/budibase/security/advisories/GHSA-gfq7-5x4g-3xhf

Frequently Asked Questions

What is CVE-2026-54353? +

Budibase is an open-source low-code platform. Prior to 3.39.9, authenticated users with automation permissions can bypass Budibase's SSRF blacklist through DNS rebinding. The outbound fetch flow validates a hostname against the blacklist before the request is sent, but the actual socket connection later performs a separate DNS lookup through node-fetch. Since the validated IPs are never pinned to the connection, an attacker-controlled hostname can return a public IP during validation and a private/internal IP during the real connection. This results in a non-blind SSRF primitive against internal services reachable from the Budibase host, including loopback, RFC1918 ranges, and cloud metadata endpoints. This vulnerability is fixed in 3.39.9. It has a CVSS v3.1 base score of 8.5 (HIGH).

How severe is CVE-2026-54353? +

CVE-2026-54353 has a CVSS v3.1 score of 8.5 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0020, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-54353? +

CVE-2026-54353 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-2026-54353? +

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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