CVE-2026-40212

Severity: medium (CVSS 5.4 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-04-10 · updated 2026-10-26
Weakness: CWE-79

Description

OpenStack Skyline before 5.0.1, 6.0.0, and 7.0.0 has a DOM-based Cross-Site Scripting (XSS) vulnerability in the console because document.write is used unsafely, which is relevant in scenarios where administrators use the console web interface to view instance console logs.

Affected products

OpenStack Skyline: before 5.0.1; 6.0.0, 7.0.0 — fixed in 5.0.1

How to fix

Upgrade to a fixed version: OpenStack Skyline 5.0.1. Check the vendor advisory for mitigations.

References

https://bugs.launchpad.net/skyline-console/+bug/2138575
https://review.opendev.org/973351
https://security.openstack.org/ossa/OSSA-2026-006.html
https://www.openwall.com/lists/oss-security/2026/04/09/30

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