CVE-2024-39817Network attack vector

Authenticated data disclosure via Custom App search

Published Aug 6, 2024 · Updated Mar 18, 2025

Sensitive-data exposure in Cybozu Office 10.0.0 through 10.8.6 allows remote authenticated users to view restricted Custom App data. Under certain conditions, Custom App search responses include records that the logged-in user lacks permission to access; Cybozu withholds the reproduction details. Any product login is the documented gate, and the resulting impact is read-only disclosure of Custom App data rather than alteration or interruption.

CVSS severity6.5
Medium
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive-data exposure in Cybozu Office 10.0.0 through 10.8.6 allows remote authenticated users to view restricted Custom App data. Under certain conditions, Custom App search responses include records that the logged-in user lacks permission to access; Cybozu withholds the reproduction details. Any product login is the documented gate, and the resulting impact is read-only disclosure of Custom App data rather than alteration or interruption.

The record

CVE
CVE-2024-39817
Published
Aug 6, 2024
Updated
Mar 18, 2025
Vendor
Cybozu
Product
Cybozu Office
Classifications
CWE-200, CWE-201, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 6, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 18, 2025Record 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=10.0.0 to 10.8.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cybozu · Cybozu Officeversion=10.0.0 to 10.8.6

Published CVSS scores

6.5NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
6.5CISA ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
4.3CybozuCVSS:3.0/AV:N/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-200Exposure of Sensitive Information to an Unauthorized Actor
CWE-201Insertion of Sensitive Information Into Sent Data
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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