CVE-2019-8400

Exp

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

Published: 2019-02-17 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-8400 is rated High Exploit Risk (63.9/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.32%). 2 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2019-8400

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2019-8400

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.34% 1.32% +0.98%
2 2025-11-21 0.37% 0.34% -0.03%
3 2025-11-18 — 0.37% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-8400

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2019-8400

GitHub Security Advisory for CVE-2019-8400

GHSA-7v6r-w4r6-mhch · Severity: medium · Ecosystem: go — Hydra has Reflected XSS via error_hint parameter

Affected software / configurations for CVE-2019-8400

Vendor Product Version Raw CPE
ory hydra 0.1 cpe:2.3:a:ory:hydra:0.1:beta1:*:*:*:*:*:*
ory hydra 0.1 cpe:2.3:a:ory:hydra:0.1:beta2:*:*:*:*:*:*
ory hydra 0.1 cpe:2.3:a:ory:hydra:0.1:beta3:*:*:*:*:*:*
ory hydra 0.1 cpe:2.3:a:ory:hydra:0.1:beta4:*:*:*:*:*:*
ory hydra 0.2.0 cpe:2.3:a:ory:hydra:0.2.0:*:*:*:*:*:*:*
ory hydra 0.3.0 cpe:2.3:a:ory:hydra:0.3.0:*:*:*:*:*:*:*
ory hydra 0.3.1 cpe:2.3:a:ory:hydra:0.3.1:*:*:*:*:*:*:*
ory hydra 0.4.0 cpe:2.3:a:ory:hydra:0.4.0:*:*:*:*:*:*:*
ory hydra 0.4.1 cpe:2.3:a:ory:hydra:0.4.1:*:*:*:*:*:*:*
ory hydra 0.4.2 cpe:2.3:a:ory:hydra:0.4.2:*:*:*:*:*:*:*
ory hydra 0.4.2 cpe:2.3:a:ory:hydra:0.4.2:alpha:*:*:*:*:*:*
ory hydra 0.4.2 cpe:2.3:a:ory:hydra:0.4.2:alpha1:*:*:*:*:*:*
ory hydra 0.4.2 cpe:2.3:a:ory:hydra:0.4.2:alpha2:*:*:*:*:*:*
ory hydra 0.4.2 cpe:2.3:a:ory:hydra:0.4.2:alpha3:*:*:*:*:*:*
ory hydra 0.4.2 cpe:2.3:a:ory:hydra:0.4.2:alpha4:*:*:*:*:*:*
ory hydra 0.4.3 cpe:2.3:a:ory:hydra:0.4.3:*:*:*:*:*:*:*
ory hydra 0.5.0 cpe:2.3:a:ory:hydra:0.5.0:*:*:*:*:*:*:*
ory hydra 0.5.1 cpe:2.3:a:ory:hydra:0.5.1:*:*:*:*:*:*:*
ory hydra 0.5.2 cpe:2.3:a:ory:hydra:0.5.2:*:*:*:*:*:*:*
ory hydra 0.5.3 cpe:2.3:a:ory:hydra:0.5.3:*:*:*:*:*:*:*
ory hydra 0.5.4 cpe:2.3:a:ory:hydra:0.5.4:*:*:*:*:*:*:*
ory hydra 0.5.5 cpe:2.3:a:ory:hydra:0.5.5:*:*:*:*:*:*:*
ory hydra 0.5.6 cpe:2.3:a:ory:hydra:0.5.6:*:*:*:*:*:*:*
ory hydra 0.5.7 cpe:2.3:a:ory:hydra:0.5.7:*:*:*:*:*:*:*
ory hydra 0.5.8 cpe:2.3:a:ory:hydra:0.5.8:*:*:*:*:*:*:*
ory hydra 0.6.0 cpe:2.3:a:ory:hydra:0.6.0:*:*:*:*:*:*:*
ory hydra 0.6.1 cpe:2.3:a:ory:hydra:0.6.1:*:*:*:*:*:*:*
ory hydra 0.6.2 cpe:2.3:a:ory:hydra:0.6.2:*:*:*:*:*:*:*
ory hydra 0.6.3 cpe:2.3:a:ory:hydra:0.6.3:*:*:*:*:*:*:*
ory hydra 0.6.4 cpe:2.3:a:ory:hydra:0.6.4:*:*:*:*:*:*:*
ory hydra 0.6.5 cpe:2.3:a:ory:hydra:0.6.5:*:*:*:*:*:*:*
ory hydra 0.6.6 cpe:2.3:a:ory:hydra:0.6.6:*:*:*:*:*:*:*
ory hydra 0.6.7 cpe:2.3:a:ory:hydra:0.6.7:*:*:*:*:*:*:*
ory hydra 0.6.8 cpe:2.3:a:ory:hydra:0.6.8:*:*:*:*:*:*:*
ory hydra 0.6.9 cpe:2.3:a:ory:hydra:0.6.9:*:*:*:*:*:*:*
ory hydra 0.6.10 cpe:2.3:a:ory:hydra:0.6.10:*:*:*:*:*:*:*
ory hydra 0.7.0 cpe:2.3:a:ory:hydra:0.7.0:*:*:*:*:*:*:*
ory hydra 0.7.1 cpe:2.3:a:ory:hydra:0.7.1:*:*:*:*:*:*:*
ory hydra 0.7.2 cpe:2.3:a:ory:hydra:0.7.2:*:*:*:*:*:*:*
ory hydra 0.7.3 cpe:2.3:a:ory:hydra:0.7.3:*:*:*:*:*:*:*
ory hydra 0.7.4 cpe:2.3:a:ory:hydra:0.7.4:*:*:*:*:*:*:*
ory hydra 0.7.5 cpe:2.3:a:ory:hydra:0.7.5:*:*:*:*:*:*:*
ory hydra 0.7.6 cpe:2.3:a:ory:hydra:0.7.6:*:*:*:*:*:*:*
ory hydra 0.7.7 cpe:2.3:a:ory:hydra:0.7.7:*:*:*:*:*:*:*
ory hydra 0.7.8 cpe:2.3:a:ory:hydra:0.7.8:*:*:*:*:*:*:*
ory hydra 0.7.9 cpe:2.3:a:ory:hydra:0.7.9:*:*:*:*:*:*:*
ory hydra 0.7.10 cpe:2.3:a:ory:hydra:0.7.10:*:*:*:*:*:*:*
ory hydra 0.7.11 cpe:2.3:a:ory:hydra:0.7.11:*:*:*:*:*:*:*
ory hydra 0.7.12 cpe:2.3:a:ory:hydra:0.7.12:*:*:*:*:*:*:*
ory hydra 0.7.13 cpe:2.3:a:ory:hydra:0.7.13:*:*:*:*:*:*:*
ory hydra 0.8.0 cpe:2.3:a:ory:hydra:0.8.0:*:*:*:*:*:*:*
ory hydra 0.8.1 cpe:2.3:a:ory:hydra:0.8.1:*:*:*:*:*:*:*
ory hydra 0.8.2 cpe:2.3:a:ory:hydra:0.8.2:*:*:*:*:*:*:*
ory hydra 0.8.3 cpe:2.3:a:ory:hydra:0.8.3:*:*:*:*:*:*:*
ory hydra 0.8.4 cpe:2.3:a:ory:hydra:0.8.4:*:*:*:*:*:*:*
ory hydra 0.8.5 cpe:2.3:a:ory:hydra:0.8.5:*:*:*:*:*:*:*
ory hydra 0.8.6 cpe:2.3:a:ory:hydra:0.8.6:*:*:*:*:*:*:*
ory hydra 0.8.7 cpe:2.3:a:ory:hydra:0.8.7:*:*:*:*:*:*:*
ory hydra 0.9.0 cpe:2.3:a:ory:hydra:0.9.0:*:*:*:*:*:*:*
ory hydra 0.9.1 cpe:2.3:a:ory:hydra:0.9.1:*:*:*:*:*:*:*
ory hydra 0.9.2 cpe:2.3:a:ory:hydra:0.9.2:*:*:*:*:*:*:*
ory hydra 0.9.3 cpe:2.3:a:ory:hydra:0.9.3:*:*:*:*:*:*:*
ory hydra 0.9.4 cpe:2.3:a:ory:hydra:0.9.4:*:*:*:*:*:*:*
ory hydra 0.9.5 cpe:2.3:a:ory:hydra:0.9.5:*:*:*:*:*:*:*
ory hydra 0.9.6 cpe:2.3:a:ory:hydra:0.9.6:*:*:*:*:*:*:*
ory hydra 0.9.7 cpe:2.3:a:ory:hydra:0.9.7:*:*:*:*:*:*:*
ory hydra 0.9.8 cpe:2.3:a:ory:hydra:0.9.8:*:*:*:*:*:*:*
ory hydra 0.9.9 cpe:2.3:a:ory:hydra:0.9.9:*:*:*:*:*:*:*
ory hydra 0.9.10 cpe:2.3:a:ory:hydra:0.9.10:*:*:*:*:*:*:*
ory hydra 0.9.11 cpe:2.3:a:ory:hydra:0.9.11:*:*:*:*:*:*:*
ory hydra 0.9.12 cpe:2.3:a:ory:hydra:0.9.12:*:*:*:*:*:*:*
ory hydra 0.9.13 cpe:2.3:a:ory:hydra:0.9.13:*:*:*:*:*:*:*
ory hydra 0.9.14 cpe:2.3:a:ory:hydra:0.9.14:*:*:*:*:*:*:*
ory hydra 0.9.15 cpe:2.3:a:ory:hydra:0.9.15:*:*:*:*:*:*:*
ory hydra 0.9.16 cpe:2.3:a:ory:hydra:0.9.16:*:*:*:*:*:*:*
ory hydra 0.10.0 cpe:2.3:a:ory:hydra:0.10.0:*:*:*:*:*:*:*
ory hydra 0.10.0 cpe:2.3:a:ory:hydra:0.10.0:alpha1:*:*:*:*:*:*
ory hydra 0.10.0 cpe:2.3:a:ory:hydra:0.10.0:alpha10:*:*:*:*:*:*
ory hydra 0.10.0 cpe:2.3:a:ory:hydra:0.10.0:alpha11:*:*:*:*:*:*
ory hydra 0.10.0 cpe:2.3:a:ory:hydra:0.10.0:alpha12:*:*:*:*:*:*

References for CVE-2019-8400

cvelogic Threat Intelligence