CVE-2020-27826

mediumpriority · track · 17EPSS 0.006 · 47 %ileEUUS
grimoire priorityP3 · Track
Exploitable?
—
no known exploitation
Likely / severe?
0.57% (47th) EPSS
CVSS 4.9 · medium
Is it mine?
15 products
Check your exposure
Who says so?
5 sources
cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

  • Fixedrh-sso7-keycloak-0:9.0.10-1.redhat_00001.1.el6sso.noarch as a component of Red Hat Single Sign-On 7.4 for RHEL 6 Serverredhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2020:5526
  • Fixedrh-sso7-keycloak-0:9.0.10-1.redhat_00001.1.el6sso.src as a component of Red Hat Single Sign-On 7.4 for RHEL 6 Serverredhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2020:5526
  • Fixedrh-sso7-keycloak-server-0:9.0.10-1.redhat_00001.1.el6sso.noarch as a component of Red Hat Single Sign-On 7.4 for RHEL 6 Serverredhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2020:5526
  • Fixedrh-sso7-keycloak-0:9.0.10-1.redhat_00001.1.el7sso.noarch as a component of Red Hat Single Sign-On 7.4 for RHEL 7 Serverredhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2020:5527
  • Fixedrh-sso7-keycloak-0:9.0.10-1.redhat_00001.1.el7sso.src as a component of Red Hat Single Sign-On 7.4 for RHEL 7 Serverredhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2020:5527
  • Fixedrh-sso7-keycloak-server-0:9.0.10-1.redhat_00001.1.el7sso.noarch as a component of Red Hat Single Sign-On 7.4 for RHEL 7 Serverredhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2020:5527
  • Fixedrh-sso7-keycloak-0:9.0.10-1.redhat_00001.1.el8sso.noarch as a component of Red Hat Single Sign-On 7.4 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2020:5528
  • Fixedrh-sso7-keycloak-0:9.0.10-1.redhat_00001.1.el8sso.src as a component of Red Hat Single Sign-On 7.4 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2020:5528
  • Fixedrh-sso7-keycloak-server-0:9.0.10-1.redhat_00001.1.el8sso.noarch as a component of Red Hat Single Sign-On 7.4 for RHEL 8redhat_csaf

    Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258

    https://access.redhat.com/errata/RHSA-2020:5528
02

cvss

Technical severity, 0–10. One row per scoring source.

8.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–high · 3.9–8.8

v2.04.9mediumAV:N/AC:M/Au:S/C:P/I:P/A:Nprimary · NVD / NIST USexploitability 6.8 · impact 4.9
v3.14.2mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:Nprimary · NVD / NIST USexploitability 1.6 · impact 2.5
v3.18.8highCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsecondary · OSV
v3.13.9lowCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)
v3.14.2mediumCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:Nsecondary · Red Hat Product Security US
03

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-250USCWE-250USCWE-250US
04

affected products (15)

Products and version ranges known to be affected.

05

advisories (4)

Vendor and ecosystem advisories describing this.

  • RHSA-2020:5526Red Hat Security Advisory: Red Hat Single Sign-On 7.4.4 security update on RHEL 62020-12-15csaf · redhat_csafUS

    New Red Hat Single Sign-On 7.4.4 packages are now available for Red Hat Enterprise Linux 6.

  • RHSA-2020:5527Red Hat Security Advisory: Red Hat Single Sign-On 7.4.4 security update on RHEL 72020-12-15csaf · redhat_csafUS

    New Red Hat Single Sign-On 7.4.4 packages are now available for Red Hat Enterprise Linux 7.

  • RHSA-2020:5528Red Hat Security Advisory: Red Hat Single Sign-On 7.4.4 security update on RHEL 82020-12-15csaf · redhat_csafUS

    New Red Hat Single Sign-On 7.4.4 packages are now available for Red Hat Enterprise Linux 8.

  • GHSA-m9cj-v55f-8x26Authentication Bypass in keycloak2022-03-18ghsa · osvUS

    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.

06

also known as (3)

Other names and identifiers for this entity.

07

sources

Which sources assert this record, and when.

cnnvdenisa_euvdnvdosvredhat_csafNVDCVE.orgMITRE
published 2021-05-28modified 2026-06-17
08

references (8)

External citations — patches, advisories, analysis.

scry

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