CVE-2023-49089: Umbraco CMS possible path traversal when creating packages from backoffice

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-12-12 · updated 2026-06-17
Weakness: CWE-22

Description

Umbraco is an ASP.NET content management system (CMS). Starting in version 8.0.0 and prior to versions 8.18.10, 10.8.1, and 12.3.0, Backoffice users with permissions to create packages can use path traversal and thereby write outside of the expected location. Versions 8.18.10, 10.8.1, and 12.3.0 contain a patch for this issue.

Affected products

Umbraco-CMS: from 8.0.0 before 8.18.10; from 10.0.0 before 10.8.1; from 12.0.0 before 12.3.0 — fixed in 10.8.1, 12.3.0, 8.18.10

How to fix

Upgrade to a fixed version: Umbraco-CMS 10.8.1, 12.3.0, 8.18.10. Check the vendor advisory for mitigations.

References

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