SSRF in Budibase Server
CVE-2026-100681
Budibase before 3.45.0 contains an unauthenticated server-side request forgery and credential exfiltration vulnerability in the Microsoft Teams webhook endpoint that accepts forged Bot Framework activities with arbitrary serviceUrl values. Attackers can submit a crafted POST request to inject an attacker-controlled serviceUrl that is persisted and used for all subsequent bot replies, causing the server to send live Microsoft OAuth access tokens in Authorization headers to the attacker's host and enabling blind internal network access.
Vulnerability class: SSRF (Server-Side Request Forgery)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (23.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
Weakness classification (CWE)
References
- GitHub Security Advisory (GHSA-942w-fccr-8r3c) (vendor-advisory)
- VulnCheck Advisory: Budibase before 3.45.0 SSRF and OAuth Token Exfiltration via Teams Webhook (third-party-advisory)
Frequently asked questions
- What is CVE-2026-100681?
- CVE-2026-100681 is a medium-severity vulnerability in Budibase Server, classified under Server-Side Request Forgery (SSRF). CVSS score: 5.4/10. Published 2026-09-26.
- How severe is CVE-2026-100681?
- Medium severity. CVSS v3 base score is 5.4 out of 10.