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Vulnerability details: VCID-m9nn-mnr2-2qbq
Vulnerability ID VCID-m9nn-mnr2-2qbq
Aliases CVE-2020-27838
GHSA-pcv5-m2wh-66j3
Summary Keycloak discloses information without authentication A flaw was found in keycloak in versions prior to 13.0.0. The client registration endpoint allows fetching information about PUBLIC clients (like client secret) without authentication which could be an issue if the same PUBLIC client changed to CONFIDENTIAL later. The highest threat from this vulnerability is to data confidentiality.
Status Published
Exploitability 2.0
Weighted Severity 8.0
Risk 10.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-287 Improper Authentication
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
cvssv3 5.3 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27838.json
epss 0.85704 https://api.first.org/data/v1/epss?cve=CVE-2020-27838
epss 0.85704 https://api.first.org/data/v1/epss?cve=CVE-2020-27838
epss 0.89101 https://api.first.org/data/v1/epss?cve=CVE-2020-27838
epss 0.89101 https://api.first.org/data/v1/epss?cve=CVE-2020-27838
epss 0.89101 https://api.first.org/data/v1/epss?cve=CVE-2020-27838
epss 0.89101 https://api.first.org/data/v1/epss?cve=CVE-2020-27838
epss 0.89101 https://api.first.org/data/v1/epss?cve=CVE-2020-27838
epss 0.89101 https://api.first.org/data/v1/epss?cve=CVE-2020-27838
cvssv3.1 6.5 https://bugzilla.redhat.com/show_bug.cgi?id=1906797
generic_textual MODERATE https://bugzilla.redhat.com/show_bug.cgi?id=1906797
cvssv3.1_qr MODERATE https://github.com/advisories/GHSA-pcv5-m2wh-66j3
cvssv3.1 6.5 https://github.com/keycloak/keycloak/commit/9356843c6c3d7097d010b3bb6f91e25fcaba378c
generic_textual MODERATE https://github.com/keycloak/keycloak/commit/9356843c6c3d7097d010b3bb6f91e25fcaba378c
cvssv3.1 6.5 https://github.com/keycloak/keycloak/pull/7790
generic_textual MODERATE https://github.com/keycloak/keycloak/pull/7790
cvssv2 4.3 https://nvd.nist.gov/vuln/detail/CVE-2020-27838
cvssv3.1 6.5 https://nvd.nist.gov/vuln/detail/CVE-2020-27838
generic_textual MODERATE https://nvd.nist.gov/vuln/detail/CVE-2020-27838
archlinux High https://security.archlinux.org/AVG-1926
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27838.json
https://api.first.org/data/v1/epss?cve=CVE-2020-27838
https://bugzilla.redhat.com/show_bug.cgi?id=1906797
https://github.com/keycloak/keycloak/commit/9356843c6c3d7097d010b3bb6f91e25fcaba378c
https://github.com/keycloak/keycloak/pull/7790
https://nvd.nist.gov/vuln/detail/CVE-2020-27838
ASA-202105-6 https://security.archlinux.org/ASA-202105-6
AVG-1926 https://security.archlinux.org/AVG-1926
cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*
cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*
GHSA-pcv5-m2wh-66j3 https://github.com/advisories/GHSA-pcv5-m2wh-66j3
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27838.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://bugzilla.redhat.com/show_bug.cgi?id=1906797
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://github.com/keycloak/keycloak/commit/9356843c6c3d7097d010b3bb6f91e25fcaba378c
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://github.com/keycloak/keycloak/pull/7790
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:M/Au:N/C:P/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-27838
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-27838
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.99346
EPSS Score 0.85704
Published At Aug. 1, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T09:10:05.804107+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-pcv5-m2wh-66j3/GHSA-pcv5-m2wh-66j3.json 37.0.0