CVE-2026-1609· NVD / CVE Program· CNA redhat

Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users

Noroxi assessment

Priority: Monitor (action score 32/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.56% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Keycloak Keycloak 26.5.3.

Low priority for now. Upgrade to Keycloak Keycloak 26.5.3 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in Keycloak. When the JSON Web Token (JWT) authorization grant preview feature is enabled and a user account is disabled, Keycloak fails to validate the user’s disabled status during JWT authorization grant processing. A remote attacker with low privileges can exploit this improper access control vulnerability by presenting a valid assertion token from an external identity provider to obtain a JWT for a disabled user. This allows unauthorized access to sensitive resources.

HighCVSS 8.1 · v3.1—No exploit Fix available

Broken access control (IDOR)

Published: Jul 15, 2026
Updated: Aug 10, 2026
EPSS: 0.5% · 45th percentile
CWE: CWE-284

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 32 / 40 · 8.1 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.5%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 8.1
CNA · redhat: 8.1; agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
redhat	build of keycloak	cpe:2.3:a:redhat:build_of_keycloak

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

redhat build of keycloak26.5.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

Keycloak Keycloak
- 26.5.0 and later · before 26.5.3affected · semver
Red Hat Red Hat JBoss Enterprise Application Platform 8
- all versionsunknown
- all versionsunknown
- all versionsunknown
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack
- all versionsunknown
- all versionsunknown
- all versionsunknown

Same product

redhat: all records

Other highest-scoring records for the same primary product.

CVE-2026-16442Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction
39Monitor
CVE-2026-16443Keycloak-services: keycloak-services: saml broker metadata import disables response signature validation
36Monitor
CVE-2026-15572Keycloak-services: keycloak-services: dcr protocol mapper type-swap policy bypass allows privilege escalation
35Monitor

Published before and after this one in the same product

← EarlierCVE-2026-14615Jul 3, 2026 · Keycloak-services: keycloak: fgap v2 parent group children endpoint bypasses per-child view permission filter
10Monitor
← EarlierCVE-2026-14781Jul 5, 2026 · Keycloak-services: keycloak-services: oidc email_verified claim incorrectly applied to userinfo email
19Monitor
Later →CVE-2026-15945Jul 16, 2026 · Keycloak-services: keycloak-services: group hierarchy search discloses hidden parent groups under fgap v2
10Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Keycloak Keycloak	26.5.3	Vendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Joy Gilbert and Reynaldo Immanuel

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2026-3797957 days apartKeycloak: keycloak: information disclosure via oidc token introspection endpoint audience bypass
26Monitor
CVE-2026-4628114 days apartKeycloak: org.keycloak.authorization: keycloak: unauthorized resource modification due to improper access control
17Monitor
CVE-2026-3429126 days apartOrg.keycloak.services.resources.account: improper access control leading to mfa deletion and account takeover in keycloak account rest api
16Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: none

Attack vector: Network
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: None

Weakness class (CWE)

CWE-284 · Improper Access Control

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Change log

Fix✗ → ✓Sep 28, 2026, 10:10 PM UTC

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References

access.redhat.com/security/cve/CVE-2026-1609

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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