CVE-2025-71327: Flowise contains an authentication bypass vulnerability in the unprotected /api/v1/account/register endpoint t

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CRITICAL 9.1REMOTEDOWNGRADE

CVE-2025-71327 is a critical-severity flaw (CVSS 9.1) affecting flowise. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Flowise contains an authentication bypass vulnerability in the unprotected /api/v1/account/register endpoint that allows unauthenticated attackers to create user accounts. Remote attackers can exploit this endpoint to register arbitrary accounts and authenticate to the system, gaining full API access without credentials.

Why this priority

Critical severity
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-06-25
Last modified	2026-10-12

Publisher (CNA): VulnCheck · Vendor: flowiseai

Last updated 2026-10-12 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-25 22:16 UTCPublished CVE record published
2026-10-12 21:10 UTCUpdated Record last modified

flowiseai flowise DOWNGRADE

Affected: 3.0.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0.1

1. Check installed version

apt-cache policy flowise || rpm -q flowise || flowise --version

2. No fixed release: DOWNGRADE to a release before 3.0.1 (Debian / Ubuntu)

apt-cache madison flowise sudo apt install flowise=<VERSION_BEFORE_3.0.1> sudo apt-mark hold flowise

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list flowise sudo dnf downgrade flowise-<VERSION_BEFORE_3.0.1> sudo dnf versionlock add flowise

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora 46 · python3.11 · FIXED · 3.11.18-1.fc46 · FEDORA-2026-cc775894f4 · source

sudo dnf upgrade --advisory=FEDORA-2026-cc775894f4

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: github.com/FlowiseAI/Flowise/security/advisories/GHSA-v5w9-prxf-w882

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-71327?

flowise: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2025-71327 being exploited?

CVE-2025-71327 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-71327 affect?

CVE-2025-71327 affects flowise. Severity is critical (CVSS 9.1). Flowise contains an authentication bypass vulnerability in the unprotected /api/v1/account/register endpoint that allows unauthenticated attackers to create user accounts. Remote attackers can exploit this endpoint to register arbitrary acc

How urgent is CVE-2025-71327?

Priority 58/100. Critical severity; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

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References

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