CVE-2025-41763Network attack vector

Authenticated information disclosure via unchecked download role

Published Mar 9, 2026 · Updated Mar 9, 2026

Improper authorization in MBS UBR firmware before 6.0.1.0 allows remote authenticated users to download administrator-only resources. The wwwdnload.cgi endpoint verifies that a session exists but does not check its assigned role before serving requested downloads. A guest account is sufficient to retrieve system backups and certificate request files, exposing information reserved for users and administrators.

CVSS severity6.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in MBS UBR firmware before 6.0.1.0 allows remote authenticated users to download administrator-only resources. The wwwdnload.cgi endpoint verifies that a session exists but does not check its assigned role before serving requested downloads. A guest account is sufficient to retrieve system backups and certificate request files, exposing information reserved for users and administrators.

The record

CVE
CVE-2025-41763
Published
Mar 9, 2026
Updated
Mar 9, 2026
Vendor
MBS GmbH
Product
UBR | LON
Classifications
CWE-497, T1005
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 9, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 9, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=0.0.0 <6.0.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

MBS GmbH · UBR | LONversion=0.0.0 <6.0.1.0
MBS GmbH · UBR-01 | Mk IIversion=0.0.0 <6.0.1.0
MBS GmbH · UBR-02version=0.0.0 <6.0.1.0

Published CVSS scores

6.5CERT VDECVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
3.5MBS GmbHCVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-497Exposure of Sensitive System Information to an Unauthorized Control Sphere
T1005Data from Local System

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.

Technologies

Your stack

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Your stack

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