Hugo is a static site generator. Starting in version 0.123.0 and prior to version 0.139.4, some HTML attributes in Markdown in the internal templates listed below not escaped in internal render hooks. Those whoa re impacted are Hugo users who do not trust their Markdown content files and are using one or more of these templates: `_default/_markup/render-link.html` from `v0.123.0`; `_default/_markup/render-image.html` from `v0.123.0`; `_default/_markup/render-table.html` from `v0.134.0`; and/or `shortcodes/youtube.html` from `v0.125.0`. This issue is patched in v0.139.4. As a workaround, one may replace an affected component with user defined templates or disable the internal templates.

AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CWE-79

https://github.com/gohugoio/hugo/commit/54398f8d572c689f9785d59e907fd910a23401b0

https://github.com/gohugoio/hugo/releases/tag/v0.139.4

https://github.com/gohugoio/hugo/security/advisories/GHSA-c2xf-9v2r-r2rx

https://gohugo.io/getting-started/configuration-markup/#renderhooksimageenabledefault