# CVE-2026-100681: Budibase unauthenticated SSRF in Microsoft Teams webhook

Source: https://junglewise.ai/threats/cve-2026-100681-budibase-before-3-45-0-contains-an-unauthenticated-server-side  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-26. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-100681 · Severity: medium · CVSS 5.4 · Published 2026-09-26

Budibase is a low-code platform used to build business applications. An attacker can exploit an unprotected webhook endpoint to inject a malicious URL that intercepts live Microsoft OAuth tokens sent by the application, gaining unauthorized access to the victim's Microsoft 365 environment and internal network resources. No authentication or user interaction is required, and the vulnerability persists after a single attack, affecting all subsequent bot communications.

Technologies: [Budibase](https://junglewise.ai/threats/technologies/budibase-budibase). Vendors: [Budibase](https://junglewise.ai/threats/vendors/budibase).

## Quick answers

**Is CVE-2026-100681 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-100681 being exploited in the wild.

**How severe is CVE-2026-100681?** Medium severity, with a CVSS score of 5.4, published 26 September 2026.

**Which products and versions are affected?** Budibase before 3.45.0.

**Is there a fix for CVE-2026-100681?** A patch was published on 2026-09-10: version 3.45.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-100681 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-100681?** Check whether you run Budibase at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

An unauthenticated endpoint in Budibase's AI Agents Microsoft Teams integration (POST /api/webhooks/ms-teams/:instance/:agentId) accepts forged Bot Framework activities without JWT/signature validation and persistently stores attacker-controlled serviceUrl values. The application then uses this poisoned URL as the base for all subsequent bot replies, sending each request with a Bearer token containing a live Microsoft OAuth access_token, effectively exfiltrating credentials to the attacker's host. Additionally, the code path bypasses Budibase's SSRF protections (fetchWithBlacklist and IP pinning), enabling blind internal network access via up to 20 HTTP redirects.

## Affected products

- Budibase Budibase before 3.45.0

## Timeline

- 2026-09-10: disclosed
- 2026-09-10: patched: version 3.45.0

## References

- [https://github.com/Budibase/budibase/security/advisories/GHSA-942w-fccr-8r3c](https://github.com/Budibase/budibase/security/advisories/GHSA-942w-fccr-8r3c)
- [https://www.vulncheck.com/advisories/budibase-before-3.45.0-ssrf-and-oauth-token-exfiltration-via-teams-webhook](https://www.vulncheck.com/advisories/budibase-before-3.45.0-ssrf-and-oauth-token-exfiltration-via-teams-webhook)

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