CVE-2020-5580Network attack vector

Authenticated SSO disclosure and modification via authorization bypass

Published Jun 30, 2020 · Updated Aug 4, 2024

Access-control bypass in Cybozu Garoon 4.0.0 through 5.0.1 allows remote authenticated users to view or alter Single sign-on settings. Cybozu identifies the locus as personal Single sign-on settings but has not published the request path or faulty authorization operation. Any logged-in user with basic privileges can reach the flaw without further interaction, exposing confidential SSO data and permitting limited configuration changes.

CVSS severity8.5
High
EPSS probability1.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Access-control bypass in Cybozu Garoon 4.0.0 through 5.0.1 allows remote authenticated users to view or alter Single sign-on settings. Cybozu identifies the locus as personal Single sign-on settings but has not published the request path or faulty authorization operation. Any logged-in user with basic privileges can reach the flaw without further interaction, exposing confidential SSO data and permitting limited configuration changes.

The record

CVE
CVE-2020-5580
Published
Jun 30, 2020
Updated
Aug 4, 2024
Vendor
Cybozu
Product
Garoon
Classifications
T1556
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 30, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record 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=4.0.0 to 5.0.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Cybozu · Garoonversion=4.0.0 to 5.0.1

Published CVSS scores

5.5JVN/IPAAV:N/AC:L/Au:S/C:P/I:P/A:N
8.5JVN/IPACVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/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 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

T1556Modify Authentication Process

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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