Vulnerability · Published May 8, 2026 · Assigned by EEF
CVE-2026-42794Reflected XSS via backslash bypass in GraphiQL js_escape in absinthe_plug
Low 2.3
In plain English
A low-severity cross-site scripting in absinthe_plug from absinthe-graphql. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).
Official description
Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in absinthe-graphql absinthe_plug allows reflected cross-site scripting via the GraphiQL interface. 'Elixir.Absinthe.Plug.GraphiQL':js_escape/1 in lib/absinthe/plug/graphiql.ex escapes single quotes and newlines in the query GET parameter before embedding it in an inline JavaScript string, but does not escape backslashes. An attacker can bypass the escaping by prefixing a quote with a backslash (e.g. \'), breaking out of the string context and executing arbitrary JavaScript in the victim's browser. This issue affects absinthe_plug: from 1.2.0 before 1.5.10.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| absinthe-graphql | absinthe_plug | 1.2.0 – before 1.5.10 |
| absinthe-graphql | absinthe_plug | 26241817cb4b9be4de3f5972c5fba3d36de3d713 – before 23a0d5658d32420086711adf4ce8f05febb09963 |
Weakness: CWE-79 · Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N