---
title: "CVE-2025-49652: BackendAI Missing Authentication for Critical Function"
url: https://erroneo.us/security/cve/CVE-2025-49652/
description: "CVE-2025-49652 (backend.ai (PyPI)): Missing Authentication in the registration feature of Lablup's BackendAI allows arbitrary users to create user accounts…"
type: vulnerability-record
section: "Security Digest"
date_published: 2025-06-09
date_modified: 2026-10-14
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2025-49652"
kev: false
cvss: 9.8
epss: 0.00427
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2025-49652: BackendAI Missing Authentication for Critical Function

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.4% , percentile 36: FIRST’s model estimates a 0.4% chance of exploitation activity in the next 30 days, higher than 36% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes backend.ai (PyPI) < 25.15.6, fixed in 25.15.6 ; backend.ai (PyPI) >= 25.16.0rc1, < 25.19.0rc1, fixed in 25.19.0rc1 . Check your lockfile, including transitive dependencies.

## What it is

Missing Authentication in the registration feature of Lablup's BackendAI allows arbitrary users to create user accounts that can access private data even when registration is disabled.

## Affected packages

- PyPI `backend.ai` < 25.15.6 → fixed: 25.15.6
- PyPI `backend.ai` >= 25.16.0rc1, < 25.19.0rc1 → fixed: 25.19.0rc1

## Affected products (CVE record)

- Lablup BackendAI: < 25.15.6

## Severity

- HiddenLayer CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.43% probability of exploitation activity in the next 30 days; percentile 36.

## Sources

- [GitHub Advisory GHSA-ww28-4m4v-cq4j](https://github.com/advisories/GHSA-ww28-4m4v-cq4j)
- [CVE.org record CVE-2025-49652](https://www.cve.org/CVERecord?id=CVE-2025-49652)
- [NVD entry CVE-2025-49652](https://nvd.nist.gov/vuln/detail/CVE-2025-49652)
- [hiddenlayer.com](https://hiddenlayer.com/sai_security_advisor/2025-06-backendai/)
- [hiddenlayer.com](https://hiddenlayer.com/sai_security_advisor/2025-05-backendai-49653)
- [github.com](https://github.com/lablup/backend.ai/commit/37fc8f70f9bad2dd01fe2e288f9006e96f9914ed)
- [github.com](https://github.com/lablup/backend.ai/commit/b6d3ddd9e285a7ce59722a37585b9298681eb82f)
- [github.com](https://github.com/lablup/backend.ai/commit/d7704f506e319acff205d91bfca6e2ca92939983)

---
Source page: https://erroneo.us/security/cve/CVE-2025-49652/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt