What’s Vulnerable › Vulnerabilities

CVE-2026-18478: Stored XSS in Magnolia CMS

• Severity: medium (CVSS 5.1 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-10 · updated 2026-10-23
• Weakness: CWE-79

Description

Magnolia CMS is vulnerable to Stored XSS in import functionality. An attacker with editor privileges can inject arbitrary HTML and JS into the name of uploaded image, which will be rendered/executed when opening uploaded image. The issue was fixed in version 6.3.10

Affected products

• Magnolia DXP Magnolia CMS: from 6.3.0 before 6.3.10 — fixed in 6.3.10

How to fix

Upgrade to a fixed version: Magnolia DXP Magnolia CMS 6.3.10. Check the vendor advisory for mitigations.

References

• https://cert.pl/en/posts/2026/08/CVE-2026-18478
• https://docs.magnolia-cms.com/product-docs/6.3/releases/release-notes-for-magnolia-cms-6.3.10/
• https://www.magnolia-cms.com/

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