NVD / CVE Program· CNA redhat

CVE-2026-16103: Keycloak-services: keycloak-services: incomplete fix for ciba brute-force lockout bypass at token redemption

Noroxi assessment

Priority: Monitor (action score 17/100)

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: 0.34% (FIRST EPSS).
Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
According to the record, no fixed version is available yet.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Update when a fix is released; follow the vendor's advisory.

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 the keycloak-services component of Keycloak. This issue is an incomplete fix for CVE-2026-9798, where brute-force protection checks were added to the Client-Initiated Backchannel Authentication (CIBA) initiation handler but were omitted from the token redemption handler. This allows an attacker with valid client credentials to obtain access and refresh tokens for a user account that has been locked due to brute-force protection, provided the authentication request was started before the lockout occurred and was approved by the user.

MediumCVSS 4.3 · v3.1—No exploit No fix recorded

EUVD-2026-45225

Published: Jul 17, 2026
Updated: Aug 31, 2026
EPSS: 0.3% · 28th percentile
CWE: CWE-305

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 17 / 40 · 4.3 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.3%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · redhat: 4.3; NVD has not scored this yet; the score shown is the CNA’s.

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
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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 keycloakall versions

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.

Red Hat Red Hat Build of Keycloak
- all versionsaffected
- all versionsaffected
- all versionsaffected
Red Hat Red Hat Data Grid 8
- all versionsunknown
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack
- all versionsunknown
Red Hat Red Hat Single Sign-On 7
- 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-2026-16089Jul 17, 2026 · Keycloak-services: keycloak-services: authorization codes can be retargeted to another client session
23Monitor
← EarlierCVE-2026-16093Jul 17, 2026 · Keycloak-services: keycloak-services: required signed-jwt assertion policy can be bypassed with unsigned assertion headers
21Monitor
Later →CVE-2026-16104Jul 17, 2026 · Keycloak-services: keycloak-services: authenticator config endpoint exposes raw recaptcha secrets to view-only admins
26Monitor

Remediation

Which version to upgrade to

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

No fix version is recorded for this entry. Check the references for vendor advisories.

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.

johanw

Variant candidates

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

CVE-2026-3047134 days apartOrg.keycloak.broker.saml: keycloak saml broker: authentication bypass due to disabled saml client completing idp-initiated login
35Monitor
CVE-2026-979850 days apartKeycloak: keycloak: brute-force protection bypass in ciba flow
17Monitor

Chain candidates

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

CVE-2026-908622 days apartKeycloak: keycloak: cross-site scripting (xss) via case-insensitive uri validation bypass
29Monitor
CVE-2026-908322 days apartKeycloak: keycloak: information disclosure through arbitrary filesystem path probing
19Monitor
CVE-2026-3798094 days apartOrg.keycloak.forms.login: keycloak: keycloak: arbitrary code execution via stored cross-site scripting (xss) in organization selection login page
19Monitor
CVE-2026-4874113 days apartOrg.keycloak.protocol.oidc.grants: org.keycloak.services.managers: keycloak: server-side request forgery via oidc token endpoint manipulation
12Monitor