CVE-2026-42794: Improper Neutralization of Input During Web Page Generation (XSS) vulnerability in absinthe-graphql absinthe_p

Routine

MEDIUM 6.1UPGRADE

CVE-2026-42794 is a medium-severity flaw (CVSS 6.1) affecting absinthe.plug. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 prefix

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-05-08
Last modified	2026-10-26

Publisher (CNA): EEF · Vendor: absinthe-graphql

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-08 16:16 UTCPublished CVE record published
2026-10-26 18:10 UTCUpdated Record last modified

absinthe-graphql absinthe.plug UPGRADE

Affected: >= 1.2.0 and < 1.5.10

Fixed in: 1.5.10

Safe to downgrade to: a release before 1.2.0

1. Check installed version

apt-cache policy absinthe.plug || rpm -q absinthe.plug || absinthe.plug --version

2. UPGRADE to 1.5.10 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade absinthe.plug

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade absinthe.plug

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.2.0 (Debian / Ubuntu)

apt-cache madison absinthe.plug sudo apt install absinthe.plug=<VERSION_BEFORE_1.2.0> sudo apt-mark hold absinthe.plug

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list absinthe.plug sudo dnf downgrade absinthe.plug-<VERSION_BEFORE_1.2.0> sudo dnf versionlock add absinthe.plug

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-42794?

absinthe.plug: upgrade to 1.5.10. Exact commands for each OS are on this page.

Is CVE-2026-42794 being exploited?

CVE-2026-42794 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-42794 affect?

CVE-2026-42794 affects absinthe.plug. Severity is medium (CVSS 6.1). 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

How urgent is CVE-2026-42794?

Priority 26/100. No elevated risk signals yet.

References

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