Hugo does not escape some attributes in internal templates

Impact

Some HTML attributes in Markdown in the internal templates listed below not escaped. 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
• shortcodes/youtube.html from v0.125.0

Patches

Patched in v0.139.4.

Workarounds

Replace with user defined templates or disable the internal templates: https://gohugo.io/getting-started/configuration-markup/#renderhooksimageenabledefault

References

• https://github.com/gohugoio/hugo/releases/tag/v0.139.4
• https://gohugo.io/about/security/