CVE-2020-10187

Doorkeeper version 5.0.0 and later contains an information disclosure vulnerability that allows an attacker to retrieve the client secret only intended for the OAuth application owner. After authorizing the application and allowing access, the attacker simply needs to request the list of their authorized applications in a JSON format (usually GET /oauth/authorized_applications.json). An application is vulnerable if the authorized applications controller is enabled.

Published: 2020-05-04 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-10187 is rated Moderate Risk (51.6/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.43%). Review affected assets and schedule remediation.

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

Exploit prediction scoring system (EPSS) score for CVE-2020-10187

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 2025-11-21 0.33% 0.43% +0.09%
2 2025-11-18 0.43% 0.33% -0.09%
3 2025-03-30 — 0.43% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-10187

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:P/I:N/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:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2020-10187

GitHub Security Advisory for CVE-2020-10187

GHSA-j7vx-8mqj-cqp9 · Severity: high · Ecosystem: rubygems — Exposure of Sensitive Information to an Unauthorized Actor in Doorkeeper

OS Trackers for CVE-2020-10187

vendor priority summary link
debian not yet assigned CVE-2020-10187 not yet assigned priority: Debian including 1 source packages (ruby-doorkeeper), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2020-10187
ubuntu medium CVE-2020-10187 medium priority: Ubuntu including 1 source packages (ruby-doorkeeper), 15 status rows across 15 suites (bionic, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, trusty, upstream, xenial): not-affected 12, DNE 1, ignored 1, released 1. https://ubuntu.com/security/CVE-2020-10187

Affected software / configurations for CVE-2020-10187

Vendor Product Version Raw CPE
doorkeeper_project doorkeeper >= 5.0.0, < 5.0.3 cpe:2.3:a:doorkeeper_project:doorkeeper:*:*:*:*:*:ruby:*:*
doorkeeper_project doorkeeper >= 5.1.0, < 5.1.1 cpe:2.3:a:doorkeeper_project:doorkeeper:*:*:*:*:*:ruby:*:*
doorkeeper_project doorkeeper >= 5.2.0, < 5.2.5 cpe:2.3:a:doorkeeper_project:doorkeeper:*:*:*:*:*:ruby:*:*
doorkeeper_project doorkeeper >= 5.3.0, < 5.3.2 cpe:2.3:a:doorkeeper_project:doorkeeper:*:*:*:*:*:ruby:*:*

References for CVE-2020-10187

cvelogic Threat Intelligence