Release notes for Umbraco-CMS v13.16.4
Released on: Tuesday, October 27 2026
NuGet Package: Umbraco.Cms v13.16.4
Install and upgrade guidance
- Quick install instructions This link leads to a site made by members of the Umbraco community, it helps make the installation of Umbraco a lot easier for you.
- Upgrade guide
Contributors
Of the 2 bug fixes and feature additions in v13.16.4, a total of 1 of them have been contributed by the community, by 1 unique contributors.
All community contributors to this release
Other
2
#24300 [v13] SixLabors.ImageSharp 3.1.12 is affected by known vulnerabilities; the 3.2.0 update from 17/18 hasn't been applied (and ImageSharp 2 package status)
Fixed in
#24339
Dependencies: Bump SixLabors.ImageSharp to 3.2.0 and ImageSharp.Web to 3.3.0 for security fixes for Umbraco 13 (closes #24300)
#24339
Dependencies: Bump SixLabors.ImageSharp to 3.2.0 and ImageSharp.Web to 3.3.0 for security fixes for Umbraco 13 (closes #24300)
#24298 Dependencies: Update MessagePack and pin System.Security.Cryptography.Pkcs and .Xml to patched versions (v13)