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Vulnerability details: VCID-1uvc-jkdm-z3fn
Vulnerability ID VCID-1uvc-jkdm-z3fn
Aliases CVE-2020-27826
GHSA-m9cj-v55f-8x26
Summary Authentication Bypass in keycloak A flaw was found in Keycloak before version 12.0.0 where it is possible to update the user's metadata attributes using Account REST API. This flaw allows an attacker to change its own NameID attribute to impersonate the admin user for any particular application.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (3)
CWE-250 Execution with Unnecessary Privileges
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 4.2 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27826.json
cvssv3.1 8.8 https://access.redhat.com/security/cve/cve-2020-27826
generic_textual HIGH https://access.redhat.com/security/cve/cve-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
epss 0.00166 https://api.first.org/data/v1/epss?cve=CVE-2020-27826
cvssv3.1 8.8 https://bugzilla.redhat.com/show_bug.cgi?id=1905089
generic_textual HIGH https://bugzilla.redhat.com/show_bug.cgi?id=1905089
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-m9cj-v55f-8x26
cvssv3.1 8.8 https://github.com/keycloak/keycloak/commit/dae4a3eaf26590b8d441b8e4bec3b700ee303b72
generic_textual HIGH https://github.com/keycloak/keycloak/commit/dae4a3eaf26590b8d441b8e4bec3b700ee303b72
cvssv2 4.9 https://nvd.nist.gov/vuln/detail/CVE-2020-27826
cvssv3.1 4.2 https://nvd.nist.gov/vuln/detail/CVE-2020-27826
cvssv3.1 8.8 https://nvd.nist.gov/vuln/detail/CVE-2020-27826
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2020-27826
archlinux Medium https://security.archlinux.org/AVG-1373
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27826.json
https://access.redhat.com/security/cve/cve-2020-27826
https://api.first.org/data/v1/epss?cve=CVE-2020-27826
https://bugzilla.redhat.com/show_bug.cgi?id=1905089
https://github.com/keycloak/keycloak/commit/dae4a3eaf26590b8d441b8e4bec3b700ee303b72
https://nvd.nist.gov/vuln/detail/CVE-2020-27826
AVG-1373 https://security.archlinux.org/AVG-1373
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:7.4:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:single_sign-on:7.4:*:*:*:*:*:*:*
cpe:2.3:a:redhat:single_sign-on:7.4.4:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:single_sign-on:7.4.4:*:*:*:*:*:*:*
cpe:2.3:a:redhat:single_sign-on:-:*:*:*:text-only:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:redhat:single_sign-on:-:*:*:*:text-only:*:*:*
GHSA-m9cj-v55f-8x26 https://github.com/advisories/GHSA-m9cj-v55f-8x26
RHSA-2020:5526 https://access.redhat.com/errata/RHSA-2020:5526
RHSA-2020:5527 https://access.redhat.com/errata/RHSA-2020:5527
RHSA-2020:5528 https://access.redhat.com/errata/RHSA-2020:5528
RHSA-2020:5533 https://access.redhat.com/errata/RHSA-2020:5533
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2020-27826.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:L/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/security/cve/cve-2020-27826
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:L/UI:N/S:U/C:H/I:H/A:H Found at https://bugzilla.redhat.com/show_bug.cgi?id=1905089
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:L/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/keycloak/keycloak/commit/dae4a3eaf26590b8d441b8e4bec3b700ee303b72
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:S/C:P/I:P/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-27826
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:H/PR:L/UI:N/S:U/C:L/I:L/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2020-27826
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:L/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2020-27826
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 0.38324
EPSS Score 0.00166
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T09:03:59.669462+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/03/GHSA-m9cj-v55f-8x26/GHSA-m9cj-v55f-8x26.json 37.0.0