CVE-2019-8400: GO-2026-4861 - Hydra has Reflected XSS via error_hint parameter in github.com/ory/hydra

CVE-2019-8400 · Severity: low · CVSS 3 · Published 2026-03-26

Hydra has Reflected XSS via error_hint parameter in github.com/ory/hydra

Technologies: github.com/ory/hydra (Go). Vendors: Go.

Quick answers

Is CVE-2019-8400 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2019-8400 being exploited in the wild.
How severe is CVE-2019-8400?
Low severity, with a CVSS score of 3, published 26 March 2026.
Which products and versions are affected?
github.com/ory/hydra (Go) SEMVER:introduced=0, SEMVER:introduced=0,fixed=1.4.8.
Is there a fix for CVE-2019-8400?
Yes. github.com/ory/hydra (Go): upgrade to 1.4.8 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2019-8400?
Check whether you run github.com/ory/hydra (Go) 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.

How to fix

  • github.com/ory/hydra (Go): upgrade to 1.4.8 or later
    go get github.com/ory/hydra@v1.4.8

Affected products

  • github.com/ory/hydra (Go) SEMVER:introduced=0, SEMVER:introduced=0,fixed=1.4.8

Identifiers

  • CVE-2019-8400
  • GHSA-7v6r-w4r6-mhch
  • GO-2026-4861

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