Is CVE-2026-42794 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-42794 being exploited in the wild.

How severe is CVE-2026-42794?

Medium severity, with a CVSS score of 6.1, published 8 May 2026.

Which products and versions are affected?

Absinthe GraphQL Plug >= 1.2.0, = 1.2.0, <= 1.5.9.

Is there a fix for CVE-2026-42794?

A patch was published on 2026-05-08: Fix committed to repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-42794 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-42794?

Check whether you run Absinthe GraphQL Plug or Erlang Absinthe Plug at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-42794: absinthe-graphql absinthe_plug reflected XSS in GraphiQL interface

Q: Is there a fix for CVE-2026-42794?

A patch was published on 2026-05-08: Fix committed to repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

Q: How is CVE-2026-42794 attacked?

It is attacked over the network, in a software library.

Q: Am I affected by CVE-2026-42794?

Check whether you run Absinthe GraphQL Plug or Erlang Absinthe Plug at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-42794 · Severity: medium · CVSS 6.1 · Published 2026-05-08

Absinthe Plug is a library used to provide a GraphQL interface for Elixir web applications. A security flaw in its GraphiQL tool allows attackers to run malicious scripts in a user's browser if the user clicks a specially crafted link. This could lead to unauthorized actions being performed on behalf of the user or the theft of sensitive session information.

Vendors: Erlang.

Quick answers

Is CVE-2026-42794 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-42794 being exploited in the wild.
How severe is CVE-2026-42794?: Medium severity, with a CVSS score of 6.1, published 8 May 2026.
Which products and versions are affected?: Absinthe GraphQL Plug >= 1.2.0, < 1.10.2; Erlang Absinthe Plug >= 1.2.0, <= 1.5.9.
Is there a fix for CVE-2026-42794?: A patch was published on 2026-05-08: Fix committed to repository Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-42794 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-42794?: Check whether you run Absinthe GraphQL Plug or Erlang Absinthe Plug at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

A reflected cross-site scripting (XSS) vulnerability exists in the GraphiQL interface of absinthe_plug. The 'js_escape/1' function in 'lib/absinthe/plug/graphiql.ex' fails to escape backslashes when processing the 'query' GET parameter before embedding it into an inline JavaScript string. An attacker can use a backslash to escape the subsequent single quote (e.g., \'), breaking out of the JavaScript string context to execute arbitrary code. This vulnerability is exploitable via a crafted URL and affects versions 1.2.0 through 1.5.9. A fix is available in version 1.5.10.

Affected products

absinthe-graphql absinthe_plug >= 1.2.0, < 1.5.10

Identifiers

CVE-2026-42794
GHSA-c62g-j346-39v5

Timeline

2022-10-14: disclosed: Issue first reported on GitHub
2026-05-08: advisory: GitHub Advisory published
2026-05-08: patched: Fix committed to repository

References

This page as Markdown. Free to reuse under CC BY 4.0 with a link back.