CVE-2026-57279Network attack vectorHinoki check available

Authenticated script execution via Scheduler XSS

Published Aug 10, 2026 · Updated Aug 10, 2026

Cross-site scripting in Cybozu Garoon Scheduler 6.17.0 through 6.17.1 allows remote authenticated users to execute script in a user's browser. Cybozu identifies Scheduler as the affected component but withholds reproduction steps and does not disclose which input is embedded into a page without safe neutralization. Exploitation requires low-privileged access and active interaction by a logged-in user, and the resulting script can alter content in that user's browser context.

CVSS severity6.8
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Cross-site scripting in Cybozu Garoon Scheduler 6.17.0 through 6.17.1 allows remote authenticated users to execute script in a user's browser. Cybozu identifies Scheduler as the affected component but withholds reproduction steps and does not disclose which input is embedded into a page without safe neutralization. Exploitation requires low-privileged access and active interaction by a logged-in user, and the resulting script can alter content in that user's browser context.

The record

CVE
CVE-2026-57279
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
Cybozu
Product
Garoon
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=6.17.0 <=6.17.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cybozu · Garoonversion=6.17.0 <=6.17.1

Published CVSS scores

6.8CybozuCVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:N
6.0JVN iPediaCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:N/VA:N/SC:N/SI:H/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 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-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

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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