CVE-2020-27826

Q: How do I fix CVE-2020-27826?

Upgrade keycloak to 12.0.0 or later.

Q: Is CVE-2020-27826 being actively exploited?

Not that we know of. CVE-2020-27826 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.57% is the estimated probability that it will be exploited in the next 30 days. That is higher than 44% of all scored CVEs.

Q: How severe is CVE-2020-27826?

CVE-2020-27826 has a CVSS v3 base score of 4.2, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2020-27826 affect?

Published advisories record a fix for keycloak (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

MEDIUM

4.2

CVSS v3

NVD

Description

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.

CWE-250

How to fix

Remediation Available

keycloakNVD

Affected:< 12.0.0Fixed in:12.0.0CVE-2020-27826derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N

Exploit Intelligence

0.57%probability of exploitation in 30 days

44thpercentile

Moderate risk: more likely to be exploited than 44% of all known CVEs.

References

Vendor Advisory1

bugzilla.redhat.com

Related Vulnerabilities

Other CWE-250 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-1222	High	8.6	64%	-	Fix
CVE-2025-12420	Critical	9.8	45%	-	Fix
CVE-2024-38813	High	7.5	17%	KEV	Fix
CVE-2025-34515	Critical	9.8	7.4%	-	-
CVE-2026-29205	High	8.6	7.2%	-	-
CVE-2019-16765	High	7.4	4.7%	-	Fix

Common questions

How do I fix CVE-2020-27826?

Upgrade keycloak to 12.0.0 or later.

Is CVE-2020-27826 being actively exploited?

Not that we know of. CVE-2020-27826 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.57% is the estimated probability that it will be exploited in the next 30 days. That is higher than 44% of all scored CVEs.

How severe is CVE-2020-27826?

CVE-2020-27826 has a CVSS v3 base score of 4.2, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2020-27826 affect?

Published advisories record a fix for keycloak (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.