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CVE-2026-61398

Apache Cloudstack vulnerability

9.1 CRITICALEPSS 0.57%
  1. Published21 Aug 2026

Description

Improper Encoding or Escaping of Output vulnerability in Apache CloudStack's UI while using Instance Reset Password functionality. This issue affects Apache CloudStack: from 4.15.1.0 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 or later, which fixes the issue.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected products

Apache Cloudstack≥ 4.15.1.0 < 4.20.3.1 · ≥ 4.21.0.0 < 4.22.1.1

Remediation

Fixed in
Apache Cloudstack≥ 4.20.3.1

References

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Frequently asked

Is CVE-2026-61398 being actively exploited?

CVE-2026-61398 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.57%.

How severe is CVE-2026-61398?

CVE-2026-61398 has a CVSS 3.1 base score of 9.1, rated critical. EPSS estimates a 0.57% probability of exploitation.

Which products are affected by CVE-2026-61398?

Affected products include Apache Cloudstack.

How do I fix CVE-2026-61398?

Upgrade affected software to a fixed version, for example Apache Cloudstack 4.20.3.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-61398 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.