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MEDIUM severity

Hydra has Reflected XSS via error_hint parameterGHSA-7v6r-w4r6-mhch

MEDIUMFix: ory/hydra@9b5bbd4

GHSA-7v6r-w4r6-mhch is a medium-severity (CVSS 6.1) Cross-site Scripting (XSS) vulnerability in github.com/ory/hydra. 2 public exploit or proof-of-concept references are indexed, so weaponization risk is real. A fix is available for github.com/ory/hydra — see the affected versions and patch details below.

Also known asCVE-2019-8400GO-2026-4861
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
2 known
Exploitation data as of Nov 4, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.3%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs71th percentile — riskier than 71% of all scored CVEsHighest risk
0.00%0.61%1.22%1.83%0.3%1.3%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected
🐹github.com/ory/hydra

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Go packages — download data is not available via public APIs for these ecosystems.

Description

ORY Hydra before v1.0.0-rc.3+oryOS.9 has Reflected XSS via the oauth2/fallbacks/error error_hint parameter.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
🐹Gogithub.com/ory/hydraall versions1.4.8go get github.com/ory/hydra@v1.4.8

Affected Products

1 product · 129 configurations
Application
hydraory
90 versions
0.10.2.00.3.00.3.10.4.00.4.10.4.20.4.30.5.00.5.10.5.20.5.3
Exploits & PoCs
2

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.

ORY Hydra before v1.0.0-rc.3+oryOS.9 has Reflected XSS via the oauth2/fa…

youtube.comNVDFeb 2019

Report on hackerone.com

hackerone.comNVDFeb 2019

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for github.com/ory/hydra, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update github.com/ory/hydra to 1.4.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-7v6r-w4r6-mhch is resolved across your whole dependency graph.

  3. Workarounds

    Escape or sanitise the affected output on the server side rather than relying on client-side filtering, and add a Content-Security-Policy that blocks inline script execution so injected markup cannot run even if it reaches the page.

Frequently Asked Questions

ORY Hydra before v1.0.0-rc.3+oryOS.9 has Reflected XSS via the oauth2/fallbacks/error error_hint parameter.
O3 Security · Impact-Aware SCA

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Hydra has Reflected XSS via error_hint parameter