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Flowise CVE-2026-41275

| EUVDEUVD-2026-25291 HIGH
Cleartext Transmission of Sensitive Information (CWE-319)
2026-04-23 GitHub_M GHSA-x5w6-38gp-mrqh
7.5
CVSS 4.0 · Vendor: GitHub_M
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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

  1. Access
    Gain MITM position on victim's network
  2. Delivery
    Victim initiates password reset
  3. Exploit
    Reset link sent over cleartext HTTP
  4. Execution
    Sniff and capture reset token
  5. Persist
    Replay token to set new password
  6. Impact
    Hijack victim account

Vulnerability Assessment

Weakness
CWE
OWASP Top 10:2025
A04:2025 - Cryptographic Failures
ASVS 5.0
V12 - Secure Communication Transport encryption
Exploitation Conditions

Exploitation requires the attacker to occupy a man-in-the-middle position on the same network segment as the victim (e.g., shared public Wi-Fi) AND the victim to actively initiate a password reset and open/transmit the resulting http:// link over that untrusted network during the token's validity window. Limiting factors: no attack is possible without a live network-interception vantage point; if the victim's traffic path is otherwise encrypted (VPN) or the reset is performed on a trusted network, interception fails; the token is single-use and time-limited, so the attacker must capture and replay it before the victim completes their own reset. This is not exploitable against a victim who never triggers a reset, and it is not a remote unauthenticated attack against a default configuration.

Impact

The signals are consistent and point to a real but conditional risk rather than a mass-exploitation event. The vendor CVSS 4.0 base score is 7.5, but its own metrics acknowledge the friction: AC:H (high complexity) and AT:P (a specific attack requirement - the attacker must hold a man-in-the-middle position) with UI:A (victim must actively perform a reset and open the link over an untrusted network). SSVC aligns with this: Exploitation=PoC (not active), Automatable=No (each attack requires a live MITM opportunity against a specific user), yet Technical Impact=Total (full account takeover). EPSS of 0.03% and the absence of any KEV listing reinforce that this is not a wormable or widely exploited issue. One nuance to flag: the 'Authentication Bypass' tag overstates the flaw - this is credential/token interception requiring a privileged network position, not a direct auth bypass. Net: patch it as good hygiene, but it is not a drop-everything emergency for most deployments.

Exploit ScenarioDerived

A victim on public airport Wi-Fi requests a password reset for their Flowise account and receives an email whose link uses http://. An attacker on the same network passively sniffs the traffic (or performs an active MITM), captures the reset token as it is transmitted in cleartext, and replays it to set a new password and take over the account. A public proof-of-concept demonstrating the insecure HTTP link is documented in HackerOne report #1888915.

This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 24, 2026

Cleartext transmission of password reset links in Flowise (via cloud.flowiseai.com) prior to version 3.1.0 allows a network-positioned man-in-the-middle attacker to intercept the reset token and hijack a victim's account. The reset email embeds the link over plain HTTP instead of HTTPS, so anyone sharing the victim's network (e.g., public Wi-Fi) can sniff the token during a reset flow. Publicly available exploit code exists (HackerOne report #1888915), but EPSS is very low (0.03%, 10th percentile) and there is no evidence of active exploitation.

RemediationAI

Vendor-released patch: 3.1.0 - upgrade Flowise to 3.1.0 or later (npm package flowise 3.1.0), which generates password reset links over HTTPS; see GHSA-x5w6-38gp-mrqh. For self-hosted operators who cannot immediately upgrade, terminate TLS in front of Flowise and configure the application/base URL to use https:// so reset links are emitted as HTTPS, and enable HTTP Strict Transport Security (HSTS) to block protocol downgrade - the trade-off is that HSTS requires a valid certificate on the mail-link domain and can break any legacy plain-HTTP access. As an operational compensating control, keep reset-token lifetimes short and invalidate tokens on first use to shrink the interception window; users on untrusted networks should avoid initiating password resets until patched. Users of cloud.flowiseai.com are covered by the vendor's fix and need take no action.

Affected VersionsENISA

Flowise < 3.1.0

Affected Packages

npm flowise fix: 3.1.0

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in npm

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

Flowise is an open-source drag-and-drop builder for large-language-model (LLM) workflows; the affected component is the hosted cloud offering at cloud.flowiseai.com and the underlying npm package 'flowise' (CPE cpe:2.3:a:flowiseai:flowise). The root cause is CWE-319 (Cleartext Transmission of Sensitive Information): the account-recovery subsystem generates the forgot-password link with an http:// scheme rather than https://, so the single-use reset token traverses the wire unencrypted. Because password reset tokens are bearer credentials, any exposure of the token in cleartext is equivalent to exposing the credential itself. Best-practice mitigations that were absent include forcing HTTPS on all sensitive links and enforcing HSTS to prevent protocol downgrade.

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Severity by source

Vendor (GitHub_M) PRIMARY 7.5 HIGH
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
vuln.today AI 6.4 MEDIUM

AV:A and AC:H because exploitation needs an adjacent-network MITM position; UI:R since the victim must initiate a reset and open the link; C:H/I:H for account takeover, A:N as availability is not directly impacted.

3.1 AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
4.0 AV:A/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
High
Attack Requirements
Present
Privileges Required
None
User Interaction
Active
Vulnerable system: Confidentiality
High
Vulnerable system: Integrity
High
Vulnerable system: Availability
High
Subsequent system: Confidentiality
None
Subsequent system: Integrity
None
Subsequent system: Availability
None

Lifecycle Timeline

4
Patch released
Apr 25, 2026 - 02:16 nvd
Patch available
Patch available
Apr 23, 2026 - 21:01 EUVD
CVSS changed
Apr 23, 2026 - 20:26 NVD
7.5 (HIGH)
CVE Published
Apr 23, 2026 - 19:33 nvd
HIGH 7.5

DescriptionCVE.org

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, the password reset functionality on cloud.flowiseai.com sends a reset password link over the unsecured HTTP protocol instead of HTTPS. This behavior introduces the risk of a man-in-the-middle (MITM) attack, where an attacker on the same network as the user (e.g., public Wi-Fi) can intercept the reset link and gain unauthorized access to the victim’s account. This vulnerability is fixed in 3.1.0.

Executive ViewAI

Why It Matters

Flowise versions prior to 3.1.0 fail to encrypt password reset links, creating an account takeover risk for users on shared networks such as public Wi-Fi. With publicly available exploit code and relatively straightforward exploitation conditions, organizations must prioritize patching; however, the low observed threat activity and availability of vendor remediation make this actionable and containable.

Business Impact: High
Compensating Controls

Apply vendor patch.

Threat Intelligence Overview

EPSS Score
0.0%
Top 90% exploitable
Prevalence
Medium
popular open-source LLM flow builder, growing but not enterprise-ubiquitous
Threat Intel
1
1 source
Data Quality
7 sources
Confidence: High
EUVD NVD CVE.org EPSS Vulnrichment GHSA GitHub VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity HIGH
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision
Scheduled
Exploitation
Poc
System Exposure· derived
Open
Automatable
No
Human Impact
High
Technical Impact
Total

Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +38
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

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