CVE-2025-49652Network attack vector

Unauthorized account creation via active signup default

Published Jun 9, 2025 · Updated Jun 11, 2025

Missing authentication in Lablup Backend.AI allows remote attackers to create active user accounts through its signup endpoint. The auth service's signup() method assigned UserStatus.ACTIVE to every newly registered user instead of requiring administrator activation. The exposed registration path needs no prior account and remains reachable when interface registration is disabled, granting user-level access to private platform data.

CVSS severity9.8
Critical
EPSS probability0.43%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Lablup Backend.AI allows remote attackers to create active user accounts through its signup endpoint. The auth service's signup() method assigned UserStatus.ACTIVE to every newly registered user instead of requiring administrator activation. The exposed registration path needs no prior account and remains reachable when interface registration is disabled, granting user-level access to private platform data.

The record

CVE
CVE-2025-49652
Published
Jun 9, 2025
Updated
Jun 11, 2025
Vendor
Lablup
Product
Backend.AI
Classifications
CWE-306, CAPEC-115, T1136
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 9, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 11, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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  1. Affected versionversion=*

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Lablup · Backend.AIversion=*

Published CVSS scores

9.8HiddenLayerCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CAPEC-115Authentication Bypass
T1136Create Account

Public exploit references

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Technologies

Your stack

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Your stack

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