What is CVE-2026-40212?

CVE-2026-40212 is a medium-severity vulnerability in Openstack Skyline, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-10.

How severe is CVE-2026-40212?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Openstack Skyline

CVE-2026-40212

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 inter…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (1.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

Affected products

Openstack Skyline — versions 0, 6.0.0, 7.0.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

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

Frequently asked questions

What is CVE-2026-40212?: CVE-2026-40212 is a medium-severity vulnerability in Openstack Skyline, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2026-04-10.
How severe is CVE-2026-40212?: Medium severity. CVSS v3 base score is 5.4 out of 10.