CVE-2026-5756Network attack vector

Unauthenticated configuration overwrite via unrestricted API endpoint

Published Apr 14, 2026 · Updated Apr 14, 2026

Missing authentication in Central Office Services 975 allows remote attackers on the same network to rewrite server configuration. The /v0/configuration endpoint persists user-supplied JSON without authentication, authorization, origin checks, or content validation. Network access to the COS server is required; changed storage, proxy, port, or service values enable data redirection, traffic interception, or testing-service interruption.

CVSS severity7.5
High
EPSS probability0.33%
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 Central Office Services 975 allows remote attackers on the same network to rewrite server configuration. The /v0/configuration endpoint persists user-supplied JSON without authentication, authorization, origin checks, or content validation. Network access to the COS server is required; changed storage, proxy, port, or service values enable data redirection, traffic interception, or testing-service interruption.

The record

CVE
CVE-2026-5756
Published
Apr 14, 2026
Updated
Apr 14, 2026
Vendor
Data Recognition Corporation
Product
Central Office Services (COS)
Classifications
T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 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=975

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Data Recognition Corporation · Central Office Services (COS)version=975

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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 exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1565.001Stored Data Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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