CVE-2026-16231

hbs is an Express view engine that wraps Handlebars. Its registerAsyncHelper API bypasses Handlebars' automatic HTML escaping: an async helper returns an opaque placeholder during the first render pass, so the double-brace expression escapes only the placeholder, and after rendering hbs substitut...

CVE-2026-16231 hbs vulnerable to XSS via registerAsyncHelper output-escaping bypass

hbs is an Express view engine that wraps Handlebars. Its registerAsyncHelper API bypasses Handlebars' automatic HTML escaping: an async helper returns an opaque placeholder during the first render pass, so the double-brace expression escapes only the placeholder, and after rendering hbs substitut...

CVE-2026-16231

hbs , an Express view engine wrapping Handlebars, has a cross-site scripting vulnerability in its registerAsyncHelper API. An async helper returns an opaque placeholder during the first render pass, so Handlebars' double-brace escaping applies only to the placeholder. After rendering, hbs substit...