CVE-2026-4325: A flaw was found in Keycloak

Routine

MEDIUM 5.3WATCHLISTDOWNGRADE

CVE-2026-4325 is a medium-severity flaw (CVSS 5.3) affecting build of 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. The SingleUseObjectProvider, a global key-value store, lacks proper type and namespace isolation. This vulnerability allows an attacker to delete arbitrary single-use entries, which can enable the replay of consumed action tokens, such as password reset links. This could lead to unauthorized access or account compromise.

Why this priority

On your watchlist

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

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.2% (top 84%)
CISA exploited list	No
Weakness	CWE-653
Published	2026-04-02
Last modified	2026-10-26

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

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-02 13:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

redhat build of keycloak DOWNGRADE

Affected: all versions · 26.2 · 26.2.15 · 26.4 · 26.4.11

Fixed in: no fixed release known

Safe to downgrade to: a release before 26.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 26.2 (Debian / Ubuntu)

apt-cache madison build-of-keycloak sudo apt install build-of-keycloak=<VERSION_BEFORE_26.2> sudo apt-mark hold build-of-keycloak

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

dnf --showduplicates list build-of-keycloak sudo dnf downgrade build-of-keycloak-<VERSION_BEFORE_26.2> sudo dnf versionlock add build-of-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-2026-4325?

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

Is CVE-2026-4325 being exploited?

CVE-2026-4325 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-2026-4325 affect?

CVE-2026-4325 affects build of keycloak. Severity is medium (CVSS 5.3). A flaw was found in Keycloak. The SingleUseObjectProvider, a global key-value store, lacks proper type and namespace isolation. This vulnerability allows an attacker to delete arbitrary single-use entries, which can enable the replay of con

How urgent is CVE-2026-4325?

Priority 28/100. On your watchlist

Software pages

Keycloak vulnerabilities

Related CVEs

CVE-2026-4634 HIGH 7.5 DOWNGRADE A flaw was found in Keycloak
CVE-2026-4636 HIGH 8.1 DOWNGRADE A flaw was found in Keycloak
CVE-2026-4282 HIGH 7.4 DOWNGRADE A flaw was found in Keycloak
CVE-2026-3872 HIGH 7.3 DOWNGRADE A flaw was found in Keycloak
CVE-2026-37980 MEDIUM 6.9 MITIGATE A flaw was found in Keycloak, specifically in the organization selection login page

References

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