High severity · published Aug 21, 2026
CVE-2026-61397
Apache CloudStack: OAuth2 Token Cross-Request Leak
7.5
CVSS
0.6%
EPSS
No
On KEV
Description
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Apache CloudStack's OAuth2 authentication plugin and Google OAuth integration.
This issue affects Apache CloudStack: from 4.19.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0.
Users are recommended to upgrade to version 4.20.3.1 or 4.22.1.1, which fixes the issue.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 48% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
Apache CloudStack · Apache Software Foundation
4.19.0.0 through 4.20.3.0; 4.21.0.0 through 4.22.1.0 · source: vendor
CL
Cloudstack · Apache
4.19.0.0 before 4.20.3.1; 4.21.0.0 before 4.22.1.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-61397
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-61397
Vendor Advisory
https://lists.apache.org/thread/g6cwddtjrwbh1d56wjz4cfp3fzfm4kbc
More from Apache CloudStack
9.1
CVE-2026-59085
Apache CloudStack: Server-Side Request Forgery (SSRF) vulnerability in webhook module
9.1
CVE-2026-61398
Apache CloudStack: Cross-Site Scripting (XSS) Vulnerability in Instance Reset Password Function in UI
9.1
CVE-2026-62440
Apache CloudStack: Improper access control in Kubernetes Service (CKS) cluster manipulation
9.1
CVE-2026-25199
Apache CloudStack: Proxmox Extension Allows Unauthorized Cross-Tenant Instance Access
8.8
CVE-2026-47359
Apache CloudStack: OS Command Injection due to unsanitized mount command