CVE-2026-61397Network attack vector

OAuth2 token disclosure via cross-request state reuse

Published Aug 21, 2026 · Updated Aug 21, 2026

Sensitive-data exposure in Apache CloudStack allows attackers to obtain OAuth2 tokens belonging to other authentication requests. The OAuth2 plugin's Google integration reuses token-bearing state across requests instead of isolating it to the originating login flow. OAuth2 is disabled by default; exposure requires an enabled, configured Google provider and overlapping or successive authentication requests.

CVSS severityUnavailable
Unscored
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

Sensitive-data exposure in Apache CloudStack allows attackers to obtain OAuth2 tokens belonging to other authentication requests. The OAuth2 plugin's Google integration reuses token-bearing state across requests instead of isolating it to the originating login flow. OAuth2 is disabled by default; exposure requires an enabled, configured Google provider and overlapping or successive authentication requests.

The record

CVE
CVE-2026-61397
Published
Aug 21, 2026
Updated
Aug 21, 2026
Vendor
The Apache Software Foundation
Product
Apache CloudStack
Classifications
CWE-200, T1528
Attack vector
network
Privileges
Unavailable

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 privilegesUnavailable in this record.

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

No CVSS assessment is available in this record.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1528Steal Application Access Token

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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