Weakness Type (CWE)

CWE-79 — CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

CAPEC

CVSS 4.0 Score

2.3

LOW

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

Vulnerability 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.

Affected

pkg:hex/absinthe_plug

Module Source File Routine
Absinthe.Plug.GraphiQL lib/absinthe/plug/graphiql.ex Absinthe.Plug.GraphiQL.js_escape/1
Status Type Version Changes / Fixed in
affected semver ⓘ 1.2.0 < *

pkg:github/absinthe-graphql/absinthe_plug

Module Source File Routine
Absinthe.Plug.GraphiQL lib/absinthe/plug/graphiql.ex Absinthe.Plug.GraphiQL.js_escape/1
Status Type Version Changes / Fixed in
affected git ⓘ 26241817cb < 23a0d5658d

Configurations

The application must mount Absinthe.Plug.GraphiQL on a route that is reachable by untrusted users. The GraphiQL interface is a developer tool and is typically disabled or restricted in production deployments.

References

Credits

  • Finder: 40826d
  • Finder: Bryan A. Enders
  • Remediation developer: Leandro Moreno
  • Remediation reviewer: Ben Wilson

CVE record as JSON:  GET /cves/CVE-2026-42794.json
OSV record as JSON:  GET /osv/EEF-CVE-2026-42794.json