Vulnerability report

Active exploitation observed Confirmed confidence Not in CISA KEV

CVE-2026-56270

Flowise

Flowise · affected before 3.1.0

Watch CVE-2026-56270 Browse KEV feed
Severity
CVSS 8.7 · High
Confidence
Confirmed
Exploit status
Observed in sensors
EPSS
2.0%
First observed
08 Jul 2026
Last observed
08 Oct 2026

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-56270 is an unauthenticated vulnerability affecting Flowise. Flowise before 3.1.0 (versions 3.0.13 and earlier) contains a missing authentication vulnerability in the /api/v1/loginmethod endpoint that allows...

Is it exploited?

Yes. Previdian sensors observed exploitation attempts with confirmed confidence.

Who is affected?

Flowise affected before 3.1.0.

What should we do?

Patch immediately, validate internet-facing exposure, and monitor for matching requests.

Overview

Flowise

Flowise before 3.1.0 (versions 3.0.13 and earlier) contains a missing authentication vulnerability in the /api/v1/loginmethod endpoint that allows unauthenticated users to retrieve an organization's complete SSO configuration, including OAuth client secrets in cleartext, by providing an organizationId parameter. Remote attackers can send a GET request to harvest sensitive API credentials for Google, Microsoft/Azure, GitHub, and Auth0 integrations.

This affects FlowiseAI Cloud and self-hosted instances where the endpoint is exposed.

Flowise Affected
Flowise
Before 3.1.0
Flowise Unaffected
Flowise
3.1.0
View vendor advisory (opens in new tab)
Published
24 Jun 2026
Exploitation Reported
08 Jul 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

microsoft nuclei_scanner

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

Previdian

Recorded 08 Jul 2026

Previdian independently recorded this as exploited after first seeing it in honeypot sensors.

Active exploitation observed

Previdian sensor

First observed 03 Jul 2026

Previdian first observed exploitation attempts targeting this vulnerability in our honeypot sensors.

Proof of concept available

Nuclei Templates

Recorded 20 Aug 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
Previdian Sensors First 2026-08-17 08:25 UTC

Operational indicators for this CVE are listed under Detection.

Sensor telemetry

First-party evidence of exploitation activity

Previdian sensors recorded exploitation attempts targeting this vulnerability. The cards and chart show volume, unique attackers, and daily activity.

148

Attempts observed

125

Unique attacker IPs

20

Attacker countries

AR · BE · BG · BR · CA · CN · DE · GB · HK · IN · JP · KR · NL · PL · PT · SE · SG · TN · TW · US

14

Sensors observed

CVE-2026-56270 exploitation attempts over the last 86 days

Daily events observed by Previdian sensors

Updated 09 Oct 2026

0
2
0
0
0
0
0
0
0
1
1
0
0
0
0
0
4
2
0
0
0
0
0
0
1
0
0
1
0
0
8
0
0
0
0
0
1
1
0
0
1
0
1
0
0
1
0
0
0
0
1
0
0
1
2
2
6
2
0
0
0
0
1
0
0
0
0
0
2
2
2
0
0
0
0
0
9
26
22
15
11
10
6
2
1
0
16 Jul 3 Aug 21 Aug 8 Sep 9 Oct

First observed 08 Jul 2026 · Last observed 08 Oct 2026

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Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
8
50
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Attacker IP Indicators

Attacker IP indicators observed · available in Pro and Enterprise.

Sensor-derived attacker IP indicators are available to Pro and Enterprise accounts under Detection and through the Pro API.

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Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-56270.yaml 20 Aug 2026

Risk and context

Severity, weaknesses, and research context

CVSS v4.0

8.7 High

Potential damage if exploited. Separate from whether attackers are using it.

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

EPSS

2.0%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Missing Authentication for Critical Function CWE-306

All CVSS Scores

CVSS v4.0 8.7 High

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

CVSS v3.1 7.5 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

Flowise <= 3.0.13 - Unauthenticated OAuth Configuration Disclosure

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. 04:31 UTC

    Public PoC available

    Public proof-of-concept code published

  2. 04:31 UTC

    Nuclei template available

    Scanner coverage available

  3. 18:25 UTC

    Indicators of compromise added (124)

    Indicators of compromise recorded

  4. 09:04 UTC

    Observed by Previdian sensors

    Evidence-backed exploitation signal

  5. 11:53 UTC

    CVE published

    Vulnerability disclosed publicly

  6. 01:47 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-56270

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-56270",
  "confidence": "Confirmed",
  "cvss_score": 8.7,
  "cvss_estimated": false,
  "epss_score": 0.02048,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": true
  },
  "sensor_telemetry": { "attempts": 148, "sensors": 14 }
}