CVE-2020-10686: A flaw was found in Keycloak version 8.0.2 and 9.0.0, and was fixed in Keycloak version 9.0.1, where a malicio

Routine

MEDIUM 4.1WATCHLISTDOWNGRADE

CVE-2020-10686 is a medium-severity flaw (CVSS 4.1) affecting keycloak. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A flaw was found in Keycloak version 8.0.2 and 9.0.0, and was fixed in Keycloak version 9.0.1, where a malicious user registers as oneself. The attacker could then use the remove devices form to post different credential IDs and possibly remove MFA devices for other users.

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	4.1 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	High
User interaction	None
EPSS exploit chance	0.7% (top 49%)
CISA exploited list	No
Weakness	CWE-285
Published	2020-05-04
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: redhat

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-05-04 21:15 UTCPublished CVE record published
2026-06-17 02:48 UTCUpdated Record last modified

redhat keycloak DOWNGRADE

Affected: 8.0.2 · 9.0.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0.2

1. Check installed version

apt-cache policy keycloak || rpm -q keycloak || keycloak --version

2. No fixed release: DOWNGRADE to a release before 8.0.2 (Debian / Ubuntu)

apt-cache madison keycloak sudo apt install keycloak=<VERSION_BEFORE_8.0.2> sudo apt-mark hold keycloak

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list keycloak sudo dnf downgrade keycloak-<VERSION_BEFORE_8.0.2> sudo dnf versionlock add keycloak

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-10686?

keycloak: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-10686 being exploited?

CVE-2020-10686 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-10686 affect?

CVE-2020-10686 affects keycloak. Severity is medium (CVSS 4.1). A flaw was found in Keycloak version 8.0.2 and 9.0.0, and was fixed in Keycloak version 9.0.1, where a malicious user registers as oneself. The attacker could then use the remove devices form to post different credential IDs and possibly re

How urgent is CVE-2020-10686?

Priority 32/100. On your watchlist

Software pages

Keycloak vulnerabilities

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CVE-2025-8419 MEDIUM 5.3 MITIGATE A vulnerability was found in Keycloak-services

References

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