Flowise: Unauthenticated OAuth2 token refresh endpoint returns access tokens — enables token theft for any connected service

Description

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.3, the POST /api/v1/oauth2-credential/refresh/:credentialId endpoint is included in WHITELIST_URLS and requires no authentication. The endpoint decrypts the stored credential, sends a refresh request to the configured OAuth provider with the client secret and refresh token, and returns the refreshed access_token in the response body. An attacker with a credential ID can use the token to access the victim's connected service and can also exhaust refresh-token quota. This issue is fixed in 3.1.3.

Scores

EPSS (exploitation in 30 days)

0.61% · top 50% of all CVEs (5 Nov 2026)

CISA SSVC

Exploitation: poc · Automatable: yes · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.2.

Weakness

• CWE-200: Exposure of Sensitive Information to an Unauthorized Actor (opens in a new tab)All about CWE-200 and its CVEs

Affected products

• FlowiseAI · Flowise

  • affected < 3.1.2

Affected packages

From reviewed advisories of the GitHub Advisory Database.

• npmflowiseGHSA-qgvm-j2hm-6m38 (opens in a new tab)

References (1)

• https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-qgvm-j2hm-6m38 (opens in a new tab)x_refsource_CONFIRMexploit

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisory GHSA-qgvm-j2hm-6m38 (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-70478](https://trackcve.app/badge/CVE-2026-70478.svg)](https://trackcve.app/cve/CVE-2026-70478)

Record last updated 5 Aug 2026, 19:05 UTC.