What’s Vulnerable › Vulnerabilities

CVE-2021-34254

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-06-28 · updated 2026-06-17
• Weakness: CWE-601

Description

Umbraco CMS before 7.15.7 is vulnerable to Open Redirection due to insufficient url sanitization on booting.aspx.

Affected products

• Umbraco-CMS: before 7.15.7 — fixed in 7.15.7

How to fix

Upgrade to a fixed version: Umbraco-CMS 7.15.7. Check the vendor advisory for mitigations.

References

• https://github.com/umbraco/Umbraco-CMS/issues/9782
• https://github.com/umbraco/Umbraco-CMS/issues/9782

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