CVE-2026-70478Public exploitNetwork attack vector

OAuth token theft via unauthenticated refresh route

Published Aug 4, 2026 · Updated Aug 4, 2026

Information disclosure in Flowise 3.1.2 and earlier allows remote attackers to obtain OAuth access tokens via a refresh request. The whitelisted POST /api/v1/oauth2-credential/refresh/:credentialId route decrypts the stored OAuth credential and returns the provider's refreshed access_token without authenticating the caller. Exploitation requires a valid credential ID and grants access to its connected service; repeated requests can also exhaust the refresh-token quota.

CVSS severity9.2
Critical
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Flowise 3.1.2 and earlier allows remote attackers to obtain OAuth access tokens via a refresh request. The whitelisted POST /api/v1/oauth2-credential/refresh/:credentialId route decrypts the stored OAuth credential and returns the provider's refreshed access_token without authenticating the caller. Exploitation requires a valid credential ID and grants access to its connected service; repeated requests can also exhaust the refresh-token quota.

The record

CVE
CVE-2026-70478
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
FlowiseAI
Product
Flowise
Classifications
CWE-200, T1528
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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=< 3.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FlowiseAI · Flowiseversion=< 3.1.2

Published CVSS scores

9.2GitHubCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:L/VA:N/SC:H/SI:L/SA:N

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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1528Steal Application Access Token

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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