Flowise: Unauthenticated OAuth2 token refresh endpoint returns access tokens — enables token theft for any connected service
Published Aug 4, 2026 · Updated Oct 24, 2026 · Also known as GHSA-qgvm-j2hm-6m38
Original summary
Normalized public record · Updated Oct 24, 2026
Flowise: Unauthenticated OAuth2 token refresh endpoint returns access tokens — enables token theft for any connected service
Publisher and source text is retained separately from QFinch interpretation.
QFinch assessment
The OAuth2 token refresh endpoint (POST /api/v1/oauth2-credential/refresh/:credentialId) is in WHITELISTURLS, meaning it requires no authentication. It decrypts the stored credential (containing clientId, clientSecret, refreshtoken), sends a refresh request to the configured OAuth provider, and returns the new accesstoken directly in the response body.
Potential impact
- OAuth2 access token theft for any connected service - Full access to the victim's third-party accounts (Google, Microsoft, GitHub, etc.) - Client secret transmitted to OAuth provider during refresh - Can also be used for DoS by exhausting refresh token quota
Evidence: public source recordsAffected products
| Affected package, product or range | Fix status |
|---|---|
| Consult the referenced vendor advisory for affected versions. | Consult source advisory |
Matching a version is only one part of assessing exposure. QFinch has not assessed your environment on this public page.
Remediation
Apply the vendor-supported fixed release or mitigation, then verify the affected component is no longer reachable.
- Confirm the affected product and reachable code path exist in your environment.
- Apply the vendor-supported patch or mitigation from the primary advisory.
- Rescan the exact deployed revision and retain verification evidence.
Evidence coverage
- SSVC priority
- MEDIUM
- Confidence
- 20%
- Aliases
- GHSA-qgvm-j2hm-6m38
Scores appear only when corresponding evidence exists. Missing data is never interpreted as zero risk.
Sources and record history
Record history
Published Aug 4, 2026 · Last refreshed Oct 24, 2026