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CVE-2019-8400

21
FAUCET Score

CVE-2019-8400 describes a Reflected Cross-Site Scripting (XSS) vulnerability in ORY Hydra versions prior to v1.0.0-rc.3+oryOS.9, specifically through the oauth2/fallbacks/error error_hint parameter. This medium-severity vulnerability (CVSS 6.1) requires user interaction and a network attack vector, potentially leading to limited impact on confidentiality and integrity. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
0.1CPE matchmatch criteria
cpe:2.3:a:ory:hydra:0.1:beta1:*:*:*:*:*:*
0.1CPE matchmatch criteria
cpe:2.3:a:ory:hydra:0.1:beta2:*:*:*:*:*:*
0.1CPE matchmatch criteria
cpe:2.3:a:ory:hydra:0.1:beta3:*:*:*:*:*:*
0.1CPE matchmatch criteria
cpe:2.3:a:ory:hydra:0.1:beta4:*:*:*:*:*:*
0.2.0CPE matchmatch criteria
cpe:2.3:a:ory:hydra:0.2.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

6.1MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.32%
Probability of exploitation in next 30 days
EPSS Percentile
67.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0132 is in the 80th percentile among its peer group of 26,219 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/ory/hydraFixed in: 1.4.8

Vendor Advisories (1)

goGHSA-7v6r-w4r6-mhchmedium

Hydra has Reflected XSS via error_hint parameter

May 14, 2022

References

drive.google.com / file/d/1-25expUYVfK6vsiCmEabUCuelOP7aUDj/view
Release NotesThird Party Advisory
github.com / ory/hydra/blob/master/CHANGELOG.md
Release NotesThird Party Advisory
github.com / ory/hydra/commit/9b5bbd48a72096930af08402c5e07fce7dd770f3
PatchThird Party Advisory
hackerone.com / reports/456333
ExploitIssue TrackingThird Party Advisory
youtube.com / watch
ExploitThird Party Advisory