CVE-2026-42794 Reflected XSS via backslash bypass in GraphiQL js_escape in absinthe_plug

Improper Neutralization of Input During Web Page Generation XSS vulnerability in absinthe-graphql absintheplug allows reflected cross-site scripting via the GraphiQL interface. 'Elixir.Absinthe.Plug.GraphiQL':jsescape/1 in lib/absinthe/plug/graphiql.ex escapes single quotes and newlines in the...

CVE-2026-42794

CVE-2026-42794 is a reflected XSS in absinthe_plug via GraphiQL. The function Elixir.Absinthe.Plug.GraphiQL:js_escape/1 escapes single quotes and newlines in the query GET parameter but does not escape backslashes, enabling an attacker to prefix a quote with a backslash (e.g., ") to break out of ...