How severe is CVE-2026-42794?

CVE-2026-42794 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-42794 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-42794?

CVE-2026-42794 affects Absinthe-graphql Absinthe.plug. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-42794?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-42794 have an EU (EUVD) identifier?

Yes. CVE-2026-42794 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28799.

When was CVE-2026-42794 published?

CVE-2026-42794 was published on 2026-05-08 and last updated on 2026-06-17.

CVE-2026-42794

CVE-2026-42794 is a medium-severity vulnerability in Absinthe-graphql Absinthe.plug with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
CVSS v4: 2.3
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28799
Weakness: CWE-79
Affected product: Absinthe-graphql Absinthe.plug
Published: 2026-05-08
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-42794?: 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.
How severe is CVE-2026-42794?: CVE-2026-42794 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-42794 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-42794?: CVE-2026-42794 affects Absinthe-graphql Absinthe.plug. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-42794?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-42794 have an EU (EUVD) identifier?: Yes. CVE-2026-42794 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28799.
When was CVE-2026-42794 published?: CVE-2026-42794 was published on 2026-05-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:absinthe-graphql:absinthe.plug:*:*:*:*:*:*:*:*

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