CVE-2026-4027Network attack vector

Authenticated attachment disclosure via missing permission validation

Published Jun 19, 2026 · Updated Jun 19, 2026

Improper access control in Flexera FlexNet Manager Suite 2025 R1 through 2025 R2 allows remote authenticated users to read attachment files. The attachment-download path returns files without validating whether the requesting account has permission to access them. Any authenticated account able to submit the relevant network request can retrieve attachments outside its authorization scope, exposing their contents without modifying them.

CVSS severity7.1
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper access control in Flexera FlexNet Manager Suite 2025 R1 through 2025 R2 allows remote authenticated users to read attachment files. The attachment-download path returns files without validating whether the requesting account has permission to access them. Any authenticated account able to submit the relevant network request can retrieve attachments outside its authorization scope, exposing their contents without modifying them.

The record

CVE
CVE-2026-4027
Published
Jun 19, 2026
Updated
Jun 19, 2026
Vendor
Revenera
Product
FlexNet Manager Suite
Classifications
CWE-284, CAPEC-1, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 19, 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=2025 R1 <=2025 R2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Revenera · FlexNet Manager Suiteversion=2025 R1 <=2025 R2

Published CVSS scores

7.1Flexera Software LLCCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
CAPEC-1Accessing Functionality Not Properly Constrained by ACLs
T1213Data from Information Repositories

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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