HighCVE-2026-15572

Red Hat build of Keycloak: Type Confusion (CVE-2026-15572)

Published 05.08.2026Last modified 10.08.2026Sources: OSV, CVE.org, BSI

What is affected, what to do

Update Red Hat build of Keycloak 26.4 to version 26.4.14-1, Red Hat build of Keycloak 26.4 to version 26.4-22, Red Hat build of Keycloak 26.6 to version 26.6.5-1.

Affected: Red Hat build of Keycloak 26.4 lt *..26.4.14-1
Red Hat build of Keycloak 26.4 lt *..26.4-22
Red Hat build of Keycloak 26.6 lt *..26.6.5-1
Red Hat build of Keycloak 26.6 lt *..26.6-11
Fixed in: Red Hat build of Keycloak 26.4 26.4.14-1
Red Hat build of Keycloak 26.4 26.4-22
Red Hat build of Keycloak 26.6 26.6.5-1
Red Hat build of Keycloak 26.6 26.6-11

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Metrics

8.8

Priority

XIEM Effective CVSS: highest available CVSS rating from NVD and vendor data.

Source: NVD, CVSS v3

8.8

CVSS v3

Severity High on the scale from 0 to 10.

Source: OSV, CVE.org, BSI

0.7 %

EPSS score

Low — model estimates < 1% exploitation likelihood.

Source: FIRST EPSS, percentile 51.3

Show all metrics

Severity: High
Priority (0–325) The priority score is a consolidated metric that condenses several individual signals into a single, action-guiding ranking: technical severity (CVSS), exploitation likelihood (EPSS), known-exploited status (KEV) and the context of the affected asset. The aim is to answer the only truly important question in vulnerability management: what first? Read in glossary: 87.19 Methodology
Exploit maturity An exploit is code or a technique that specifically uses a concrete vulnerability to force unintended behaviour — such as executing code or escalating privileges. It is the tool that turns a theoretical flaw into a practical attack. Read in glossary: no public PoC known
XIEM Effective CVSS XIEM® is the tiered managed-security operating model from NEOSEC and a registered trademark of NEOSEC GmbH. It extends classic SIEM — the central collection, normalisation and correlation of security-relevant events — with endpoint forensics, network visibility and deception technology, and consolidates them into three building tiers: Sentry, Orchestrate and Command. Read in glossary: 8.8 Methodology
CVSS v3 CVSS is the globally established, open standard for assessing the technical severity of a vulnerability on a scale from 0 to 10. It describes how easily a flaw can be exploited and what damage it can cause — but not how likely its actual exploitation is. CVSS and the complementary EPSS deliberately answer different questions. Read in glossary: 8.8
EPSS score The EPSS score is the absolute model output for an individual vulnerability: the estimated probability of real-world exploitation within the next 30 days, expressed as a value between 0 and 1 (i.e. 0 % to 100 %). A score of 0.42 means „the model estimates a 42 % chance of real-world exploitation within 30 days“. Read in glossary: 0.7 %; Low — model estimates < 1% exploitation likelihood.
EPSS percentile The EPSS percentile is the relative position of a vulnerability within all EPSS-scored CVEs, expressed as a value between 0 and 1. A percentile of 0.90 means „this CVE has a higher EPSS score than 90 % of all other scored CVEs“. Unlike the EPSS score, it is not a probability — but a positioning within a ranking. Read in glossary: 51.3; High — this CVE ranks above the median of all CVEs scored today (rank ≥ 36%).
KEV status The KEV catalogue is a list maintained by the US authority CISA of vulnerabilities for which active exploitation in the wild has been confirmed. It answers not the question „how severe?“ but „is it already being attacked?“ — thereby sharply prioritising patching. Read in glossary: —
Published: 05.08.2026
CISA assessment (SSVC): Exploitation: none known · not automatable · Technical impact: total; Source: CISA Vulnrichment, as of 5 August 2026
CWE CWE is a catalogue of typical weakness types in software and hardware — such as flawed input validation, unsafe memory handling or poor authentication. Where a CVE names a concrete vulnerability in a concrete product, a CWE describes the underlying class of defect. Read in glossary: CWE-843

Detection rules

No NEOSEC detection rule is available for this vulnerability yet.

Classification under NIS2 and CRA

Rule-based classification from exploitation status and severity. It does not replace a case-by-case assessment.

NIS2 NIS2 is EU Directive (EU) 2022/2555 to raise the level of cybersecurity across the Union. It substantially broadens obligations compared with the first NIS directive: more sectors, mandatory risk management, staged reporting duties and personal accountability of senior management. Read in glossary: High technical severity: assess and remediate the vulnerability in vulnerability handling under Art. 21(2)(e) NIS2 and document the decision.
CRA The CRA is EU Regulation (EU) 2024/2847 setting horizontal cybersecurity requirements for „products with digital elements“ — from industrial controllers and software to connected consumer devices. For the first time manufacturers must ensure security across the entire product lifecycle, handle vulnerabilities and provide security updates. Read in glossary: From 11.12.2027, Annex I Part II CRA requires manufacturers of affected products with digital elements to handle vulnerabilities without delay and provide security updates.
ISO/IEC 27001 ISO/IEC 27001 is the internationally leading standard for an information security management system (ISMS). It describes a risk-based, process-oriented framework to systematically plan, implement, review and improve information security. Read in glossary: Control A.8.8, management of technical vulnerabilities: assess relevance to your systems, plan remediation and keep evidence.

Description

A flaw was found in Keycloak's Dynamic Client Registration (DCR) security policy management. The "Allowed Protocol Mapper Types" policy, which restricts which types of data mappers a client can use, fails to re-validate the mapper type during a client update if the mapper's configuration remains unchanged. An attacker with client registration privileges can exploit this by first registering an allowed mapper type with a malicious configuration and then swapping it for a restricted, high-privilege mapper type (such as one that hardcodes administrative roles). This allows the attacker to gain full administrative access to the Keycloak realm.

Source: OSV (Open Source Vulnerabilities), cvelistv5, NVD (NIST), BSI WID Portal, BSI CSAF

Affected products

The following versions are affected. Older releases of the same product line are also vulnerable unless stated otherwise.

Affected products
		Affected versions	Fixed in
Red Hat	Red Hat build of Keycloak 26.4	`< 26.4-22` `< 26.4.14-1`	`26.4-22` `26.4.14-1`
Red Hat	Red Hat build of Keycloak 26.4.14	`—`	—
Red Hat	Red Hat build of Keycloak 26.6	`< 26.6.5-1` `< 26.6-11`	`26.6.5-1` `26.6-11`
Red Hat	Red Hat build of Keycloak 26.6.5	`—`	—
redhat	build_of_keycloak	`26.4 – < 26.4.14` `26.6 – < 26.6.5`	`26.4.14` `26.6.5`
Open Source	Keycloak Red Hat build of Keycloa	`< 26.6.5-1` `< 26.4-22` `< 26.4.14-1` `< 26.6-11`	`26.6.5-1` `26.4-22` `26.4.14-1` `26.6-11`

Distribution and container packages (2)

Downstream packages (e.g. Bitnami, Debian, Ubuntu, Red Hat). Versions refer to the distribution, not the vendor.

Distribution and container packages
		Affected versions	Fixed in
bitnami	keycloak	`26.4.0` `26.6.0`	— —

Vendors and products

Weakness classes (CWE)

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
Base
The product allocates or initializes a resource such as a pointer, object, or variable using one type, but it later accesses that resource using a type that is incompatible with the original type.
Entry at MITRE CWE-843

References & sources

access.redhat.comRHSA-2026:50846web, Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:50847web, Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:50848web, Vendor advisory, x_refsource_REDHAT
access.redhat.comRHSA-2026:50849web, Vendor advisory, x_refsource_REDHAT
access.redhat.comsecurity/cve/CVE-2026-15572web, Vulnerability database, x_refsource_REDHAT
bugzilla.redhat.comRHBZ#2499592web, Issue tracking, x_refsource_REDHAT
NVD (NIST)vuln/detail/CVE-2026-15572web

Changes to this CVE

Who changed this CVE and when: NVD (analysis, affected products, CVSS), the CVE publisher (CNA) and additional providers such as CISA (ADP).

10.08.2026Initial analysis by NVDNVD

Newly listed as affected:

Red Hat Build of Keycloak (26.4 – before 26.4.14; 26.6 – before 26.6.5)

New references:

and 2 more references

Show 7 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Product configuration	added	—	OR cpe:2.3:a:redhat:build_of_keycloak::::::::* versions from (including) 26.4 up to (excluding) 26.4.14 cpe:2.3:a:redhat:build_of_keycloak::::::::* versions from (including) 26.6 up to (excluding) 26.6.5
Reference type	added	—	Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:50846 Types: Vendor Advisory
Reference type	added	—	Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:50847 Types: Vendor Advisory
Reference type	added	—	Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:50848 Types: Vendor Advisory
Reference type	added	—	Red Hat, Inc.: https://access.redhat.com/errata/RHSA-2026:50849 Types: Vendor Advisory
Reference type	added	—	Red Hat, Inc.: https://access.redhat.com/security/cve/CVE-2026-15572 Types: Vendor Advisory
Reference type	added	—	Red Hat, Inc.: https://bugzilla.redhat.com/show_bug.cgi?id=2499592 Types: Issue Tracking, Vendor Advisory

Source identifier: nvd@nist.gov

05.08.2026Record modifiedRed Hat

1 individual change: Affected versions (publisher)

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	changed	Red Hat build of Keycloak 26.4, Red Hat build of Keycloak 26.4, Red Hat build of Keycloak 26.4 (+5)	Red Hat build of Keycloak 26.4, Red Hat build of Keycloak 26.4, Red Hat build of Keycloak 26.4 (+5)

Source identifier: secalert@redhat.com

05.08.2026Record modifiedCISA ADP

CISA assessment (SSVC): exploitation: none known, automatable: no

Show the original change

Individual changes of this event as published by NVD
Type	Action	Before	After
SSVC assessment	added	—	{"id":"CVE-2026-15572","role":"CISA Coordinator","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"version":"2.0.3","timestamp":"2026-08-05T18:11:15.009019Z"}

Source identifier: 134c704f-9b21-4f2e-91b3-4a467353bcc0

05.08.2026ReceivedRed Hat

CVSS V3.1: AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness type: CWE-843

Description added or changed

New references:

Show 6 original changes

Individual changes of this event as published by NVD
Type	Action	Before	After
Affected versions (publisher)	added	—	Red Hat Build of Keycloak
Description	added	—	A flaw was found in Keycloak's Dynamic Client Registration (DCR) security policy management. The "Allowed Protocol Mapper Types" policy, which restricts which types of data mappers a client can use, fails to re-validate the mapper type during a client update if the mapper's configuration remains unchanged. An attacker with client registration privileges can exploit this by first registering an allowed mapper type with a malicious configuration and then swapping it for a restricted, high-privilege mapper type (such as one that hardcodes administrative roles). This allows the attacker to gain full administrative access to the Keycloak realm.
CVSS	added	—	AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness type (CWE)	added	—	CWE-843
Reference	added	—	https://access.redhat.com/security/cve/CVE-2026-15572
Reference	added	—	https://bugzilla.redhat.com/show_bug.cgi?id=2499592

Source identifier: secalert@redhat.com

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<a href="https://intel.neosec.eu/en/cve/CVE-2026-15572"><img src="https://intel.neosec.eu/badge/cve/CVE-2026-15572.svg?lang=en" alt="CVE-2026-15572 – NEOSEC Intel" height="20"></a>