CVE-2026-42794CWE-79

Reflected XSS via backslash bypass in GraphiQL js_escape in absinthe_plug

Low · published May 8, 2026

CVSS v4.0
2.3
EPSS
0%
Percentile
30.3
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
2.3 · LOW
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
EPSS
0.00376 · 30.3th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-05-08T15:42Z
EPSS history
Timeline
  • 08 MAY 15:42Z
    Reflected XSS via backslash bypass in GraphiQL js_escape in absinthe_plug
    cvelistv5