CVE-2025-54739Network attack vector

Unauthenticated access to limited information

Published Aug 14, 2025 · Updated Apr 28, 2026

Missing authorization in Nexter Blocks 4.5.4 and earlier allows remote attackers to access unspecified privileged functionality. The published advisory does not identify the affected handler, request parameter, or authorization operation that fails. Exploitation requires no account or user interaction and exposes limited information, with no reported ability to modify data or interrupt service.

CVSS severity5.3
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

Missing authorization in Nexter Blocks 4.5.4 and earlier allows remote attackers to access unspecified privileged functionality. The published advisory does not identify the affected handler, request parameter, or authorization operation that fails. Exploitation requires no account or user interaction and exposes limited information, with no reported ability to modify data or interrupt service.

The record

CVE
CVE-2025-54739
Published
Aug 14, 2025
Updated
Apr 28, 2026
Vendor
POSIMYTH Innovations
Product
Nexter Blocks
Classifications
CWE-862, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 14, 2025CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=0 <=4.5.4 changes=[{"at":"4.5.5","status":"unaffected"}]

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

POSIMYTH Innovations · Nexter Blocksversion=0 <=4.5.4 changes=[{"at":"4.5.5","status":"unaffected"}]

Published CVSS scores

5.3PatchstackCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1190Exploit Public-Facing Application

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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