CVE-2026-73410Public exploitNetwork attack vector

Authenticated SSRF via DNS rebinding

Published Aug 17, 2026 · Updated Aug 17, 2026

Server-side request forgery in Budibase before 3.40.0 allows remote authenticated users to reach internal services via REST datasources. In packages/server/src/integrations/rest.ts, the REST integration calls fetchWithBlacklist but sends requests through undici with a dispatcher that re-resolves the hostname, so the pinned IP from packages/backend-core/src/utils/outboundFetch.ts is ignored after validation. Builder-level access to configure or run a REST datasource is required, and a rebinding host can then issue arbitrary HTTP methods with full response access against internal-only endpoints.

CVSS severity8.5
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Server-side request forgery in Budibase before 3.40.0 allows remote authenticated users to reach internal services via REST datasources. In packages/server/src/integrations/rest.ts, the REST integration calls fetchWithBlacklist but sends requests through undici with a dispatcher that re-resolves the hostname, so the pinned IP from packages/backend-core/src/utils/outboundFetch.ts is ignored after validation. Builder-level access to configure or run a REST datasource is required, and a rebinding host can then issue arbitrary HTTP methods with full response access against internal-only endpoints.

The record

CVE
CVE-2026-73410
Published
Aug 17, 2026
Updated
Aug 17, 2026
Vendor
Budibase
Product
Budibase
Classifications
CWE-918, CWE-367, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.40.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Budibase · Budibaseversion=< 3.40.0

Published CVSS scores

8.5GitHub, Inc.CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-918Server-Side Request Forgery (SSRF)
CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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