CVE-2026-59655Network attack vector

Unauthenticated client-secret disclosure via provider listing

Published Aug 21, 2026 · Updated Aug 21, 2026

Information disclosure in the Apache CloudStack OAuth plugin allows remote attackers to read OAuth provider client secrets without authentication. The provider-listing response includes the stored client-secret field instead of omitting sensitive credential material. Exposure requires a configured OAuth provider on 4.19.0.0 through 4.20.3.0 or 4.21.0.0 through 4.22.1.0 and exposes that OAuth client credential.

CVSS severity7.5
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in the Apache CloudStack OAuth plugin allows remote attackers to read OAuth provider client secrets without authentication. The provider-listing response includes the stored client-secret field instead of omitting sensitive credential material. Exposure requires a configured OAuth provider on 4.19.0.0 through 4.20.3.0 or 4.21.0.0 through 4.22.1.0 and exposes that OAuth client credential.

The record

CVE
CVE-2026-59655
Published
Aug 21, 2026
Updated
Aug 21, 2026
Vendor
The Apache Software Foundation
Product
Apache CloudStack
Classifications
CWE-200, T1552
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 21, 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=4.19.0.0 <=4.20.3.0
  2. Affected versionversion=4.21.0.0 <=4.22.1.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache CloudStackversion=4.19.0.0 <=4.20.3.0; version=4.21.0.0 <=4.22.1.0

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1552Unsecured Credentials

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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