CVE-2026-100681 Budibase before 3.45.0 SSRF and OAuth Token Exfiltration via Teams Webhook
Unauthenticated attackers can exploit SSRF in Budibase Teams webhooks to exfiltrate OAuth tokens and access internal networks.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-100681?
CVE-2026-100681 is a medium-severity server-side request forgery vulnerability in budibase server, published on 26 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-918
Which versions are affected by CVE-2026-100681?
How do I fix CVE-2026-100681?
No fix has been published for CVE-2026-100681 yet. Limit exposure of the affected software until one is available.
Upgrade, and send outbound requests through an allow-list that blocks internal addresses. More about Server-side request forgery.
Is CVE-2026-100681 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-100681 exists.
Sources
Also known as GHSA-942w-fccr-8r3c, GHSA-v4j8-r967-w6rg.