CVE-2026-5228Network attack vector

Authenticated access to ACL-restricted functions

Published Jun 4, 2026 · Updated Jun 4, 2026

Missing authorization in Kurt Software Studio WriteUp Mobile App allows remote authenticated users to access restricted functions. The CNA and its sole advisory do not identify the affected endpoint, permission check, or ACL operation that fails to authorize a request. Versions 1.3.0 through 04062026 require a low-privileged account and network reachability; exploitation crosses assigned ACL boundaries, but the specific functions and resulting actions are undisclosed.

CVSS severity8.8
High
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 Kurt Software Studio WriteUp Mobile App allows remote authenticated users to access restricted functions. The CNA and its sole advisory do not identify the affected endpoint, permission check, or ACL operation that fails to authorize a request. Versions 1.3.0 through 04062026 require a low-privileged account and network reachability; exploitation crosses assigned ACL boundaries, but the specific functions and resulting actions are undisclosed.

The record

CVE
CVE-2026-5228
Published
Jun 4, 2026
Updated
Jun 4, 2026
Vendor
Kurt Software Studio
Product
WriteUp Mobile App
Classifications
CWE-862, CWE-284
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 4, 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=1.3.0 <=04062026

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Kurt Software Studio · WriteUp Mobile Appversion=1.3.0 <=04062026

Published CVSS scores

8.8Computer Emergency Response Team of the Republic of TurkeyCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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-862Missing Authorization
CWE-284Improper Access Control

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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