CVE-2025-62844Known exploitationNetwork attack vector

Authentication bypass via arbitrary QCloud account

Published Mar 20, 2026 · Updated Mar 20, 2026

Authentication bypass in QNAP QuRouter before 2.6.2.007 allows remote attackers on the local network to access sensitive information. The login.newAuthMiddleware.Authenticator endpoint accepts the qurouter_token parameter for an arbitrary QCloud account as authenticated. The attack requires local-network reachability but no prior authentication or user interaction; successful requests gain authenticated router access.

CVSS severity5.5
Medium
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in QNAP QuRouter before 2.6.2.007 allows remote attackers on the local network to access sensitive information. The login.newAuthMiddleware.Authenticator endpoint accepts the qurouter_token parameter for an arbitrary QCloud account as authenticated. The attack requires local-network reachability but no prior authentication or user interaction; successful requests gain authenticated router access.

The record

CVE
CVE-2025-62844
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
Linn Products Limited
Product
QuRouter
Classifications
CWE-1390, CAPEC-115, T1078
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.x <2.6.2.007

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Linn Products Limited · QuRouterversion=2.6.x <2.6.2.007

Published CVSS scores

4.0QNAP Systems, Inc.CVSS:4.0/AV:P/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationReported
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1390Weak Authentication
CAPEC-115Authentication Bypass
T1078Valid Accounts

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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