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PatchSiren cyber security CVE debrief

CVE-2026-59655 Apache Software Foundation CVE debrief

Apache CloudStack's OAuth authentication plugin exposure of sensitive information to unauthorized actors while listing OAuth providers affects versions from 4.19.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. This issue allows unauthorized actors to access sensitive information. Users should upgrade to 4.20.3.1 or 4.22.1.1 or later. Evidence of exposure and potential impact should be verified by defenders. The CVE record was published on 2026-08-21T09:16:38.533Z and has not been modified since then. Official CVE and NVD records provide limited information; verification needed.

Vendor
Apache Software Foundation
Product
Apache CloudStack
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-21
Original CVE updated
2026-08-27
Advisory published
2026-08-21
Advisory updated
2026-08-27

Who should care

Users of Apache CloudStack versions 4.19.0.0 through 4.20.3.0 and 4.21.0.0 through 4.22.1.0 should be aware of this vulnerability and take necessary actions to protect their systems. This includes operators, platform administrators, vulnerability management teams, and security teams responsible for ensuring the security and integrity of their CloudStack deployments.

Technical summary

The OAuth authentication plugin in Apache CloudStack exposes sensitive information to unauthorized actors when listing OAuth providers. This issue affects Apache CloudStack versions from 4.19.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. The vulnerability is addressed in versions 4.20.3.1 and 4.22.1.1 or later. Technical teams should review the vulnerability details and assess the impact on their deployments.

Defensive priority

Upgrade to fixed version 4.20.3.1 or 4.22.1.1.

Recommended defensive actions

  • Upgrade to version 4.20.3.1 or 4.22.1.1 or later
  • Inventory affected systems
  • Monitor for unauthorized access attempts
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

Official CVE and NVD records provide limited information; verification needed. The OAuth authentication plugin in Apache CloudStack exposes sensitive information to unauthorized actors when listing OAuth providers. This issue affects Apache CloudStack versions from 4.19.0.0 through 4.20.3.0 and from 4.21.0.0 through 4.22.1.0. The vulnerability is addressed in versions 4.20.3.1 and 4.22.1.1 or later. Evidence of exposure and potential impact should be verified by defenders.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-59655 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-59655

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-59655 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-59655

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.