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Full vulnerability report · 2026
CVE-2026-16102High confidence

Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers

Red Hat · Red Hat build of Keycloak 26.4

Official source articles: Red Hat RHSA-2026:50846 ↗ · Red Hat RHSA-2026:50847 ↗ · Red Hat RHSA-2026:50848 ↗ · Red Hat RHSA-2026:50849 ↗. Check the applicable product and release in the original source.

8.1HighCVSS 3.1
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 0.46% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Red Hat Red Hat build of Keycloak 26.4 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-16102 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitykeycloak-services: keycloak-services: Default DCR policy allows role forgery via User Property mappers
1 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • keycloak-services as a component of Red Hat Single Sign-On 7
Summary
A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management solution. The default DCR policy fails to properly validate the claim path for User Property mappers, allowing them to write values to sensitive internal claim locations. An attacker with a standard user account and a limited Initial Access Token can exploit this to forge administrative roles in their access token. This allows the attacker to take over other clients, steal confidential secrets, and potentially gain full administrative control over the realm.
Remediation
Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-53382

No EUVD known-exploited evidence

A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management solution. The default DCR policy fails to properly validate the claim path for User Property mappers, allowing them to write values to sensitive internal claim locations. An attacker with a standard user account and a limited Initial Access Token can exploit this to forge administrative roles in their access token. This allows the attacker to take over other clients, steal confidential secrets, and potentially gain full administrative control over the realm.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
8.1 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management solution. The default DCR policy fails to properly validate the claim path for User Property mappers, allowing them to write values to sensitive internal claim locations. An attacker with a standard user account and a limited Initial Access Token can exploit this to forge administrative roles in their access token. This allows the attacker to take over other clients, steal confidential secrets, and potentially gain full administrative control over the realm.

What

A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management solution. The default DCR policy fails to properly validate the claim path for User Property mappers, allowing them to write values to sensitive internal claim locations. An attacker with a standard user account and a limited Initial Access Token can exploit this to forge administrative roles in their access token. This allows the attacker to take over other clients, steal confidential secrets, and potentially gain full administrative control over the realm.

Why

If a web server does not fully parse requested URLs before it examines them for authorization, it may be possible for an attacker to bypass authorization protection.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management solution. The default DCR policy fails to properly validate the claim path for User Property mappers, allowing them to write values to sensitive internal claim locations. An attacker with a standard user account and a limited Initial Access Token can exploit this to forge administrative roles in their access token. This allows the attacker to take over other clients, steal confidential secrets, and potentially gain full administrative control over the realm.

Why

If a web server does not fully parse requested URLs before it examines them for authorization, it may be possible for an attacker to bypass authorization protection.

How

An attacker operating through a network path may attempt exploitation with low privileges. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Incorrect Behavior Order: Authorization Before Parsing and Canonicalization → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
Low: a basic authenticated account is required
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-551 ↗

CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization. If a web server does not fully parse requested URLs before it examines them for authorization, it may be possible for an attacker to bypass authorization protection.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRLowPrivileges required: The attacker needs basic user-level privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CHighConfidentiality impact: A successful attack can cause a major loss.IHighIntegrity impact: A successful attack can cause a major loss.ANoneAvailability impact: No direct loss is represented by this metric.
Post-exploitation / living off the land
Stolen credentials, tokens and legitimate administration functions may provide continued access without deploying a large custom toolset.
NetworkCWE-551
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-53382Official EUVD mapping

A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management solution. The default DCR policy fails to properly validate the claim path for User Property mappers, allowing them to write values to sensitive internal claim locations. An attacker with a standard user account and a limited Initial Access Token can exploit this to forge administrative roles in their access token. This allows the attacker to take over other clients, steal confidential secrets, and potentially gain full administrative control over the realm.

Official EUVD record ↗
BSI · German · WID-SEC-2026-2677RedHat Build of Keycloak: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Keycloak ausnutzen, um Administratorrechte zu erlangen, Benutzerkonten zu übernehmen, Sicherheitsmaßnahmen zu umgehen, vertrauliche Informationen offenzulegen, Daten zu manipulieren oder einen Denial-of-Service-Zustand herbeizuführen.

Official advisory ↗
Cyber Security Agency of Singapore · English · CSA-SB-20260812Security Bulletin 12 Aug 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 12 Aug 2026, published on 12 August 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-0976Multiples vulnérabilités dans KeyCloak

De multiples vulnérabilités ont été découvertes dans KeyCloak. Certaines d'entre elles permettent à un attaquant de provoquer une élévation de privilèges, un déni de service à distance et une atteinte à la confidentialité des données.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-027957レッドハットのbuild of keycloak等の複数製品におけるアクセス制御に関する脆弱性

Keycloakのアイデンティティおよびアクセス管理ソリューションにおけるDynamic Client Registration（DCR）コンポーネントに脆弱性が発見されました。デフォルトのDCRポリシーはユーザープロパティマッパーのクレームパスを適切に検証しておらず、そのためマッパーが機密性の高い内部クレームの場所に値を書き込むことが可能になっています。標準ユーザーアカウントと限定的な初期アクセストークンを持つ攻撃者は、これを悪用して自身のアクセストークンに管理者ロールを偽造できます。この脆弱性により、攻撃者は他のクライアントを乗っ取り、機密の秘密情報を盗み、さらにはレルム全体の管理権限を完全に掌握することが可能です。

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
keycloak-services as a component of Red Hat Single Sign-On 7
Fixed
Action
Before applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
Official vendor articles5 stored documents

Linked articles are downloaded and versioned as source evidence. A CVE mention or approved update relationship does not, by itself, verify a fix for every product branch.

  • Vendor release notes →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Red Hat Product Errata RHSA-2026:50846 - Security Advisory Issued: 2026-08-05 Updated: 2026-08-05 RHSA-2026:50846 - Security Advisory Overview Synopsis Important: Red Hat build of Keycloak 26.4.14 Security Update Type/Severity Security Advisory: Important Topic New Red Hat build of Keycloak 26.4.14 packages are a
  • Vendor release notes →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Red Hat Product Errata RHSA-2026:50847 - Security Advisory Issued: 2026-08-05 Updated: 2026-08-05 RHSA-2026:50847 - Security Advisory Overview Updated Images Synopsis Important: Red Hat build of Keycloak 26.4.14 Images Security Update Type/Severity Security Advisory: Important Topic New images are available for
  • Vendor release notes →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Red Hat Product Errata RHSA-2026:50848 - Security Advisory Issued: 2026-08-05 Updated: 2026-08-05 RHSA-2026:50848 - Security Advisory Overview Synopsis Important: Red Hat build of Keycloak 26.6.5 Security Update Type/Severity Security Advisory: Important Topic New Red Hat build of Keycloak 26.6.5 packages are ava
  • Vendor release notes →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026Red Hat Product Errata RHSA-2026:50849 - Security Advisory Issued: 2026-08-05 Updated: 2026-08-05 RHSA-2026:50849 - Security Advisory Overview Updated Images Synopsis Important: Red Hat build of Keycloak 26.6.5 Images Security Update Type/Severity Security Advisory: Important Topic New images are available for R
  • CVE-2026-16102 - Red Hat Customer Portal →Original publisher ↗Searchable text snapshot · Captured 29 Sep 2026CVE-2026-16102 Description A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management solution. The default DCR policy fails to properly validate the claim path for User Property mappers, allowing them to write values to sensitive internal claim locations. An atta
04

Evidence and provenance

Published 5 Aug 2026 · Last source change 31 Aug 2026, 11:25 UTC · CWE-551 · Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2026-53382
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD modified after enrichment

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    See the vendor and CVE records for the affected range. · Fixed: 26.4.14-1 < *; 26.4-22 < *; 26.6.5-1 < *; 26.6-11 < *
    After
    See the vendor and CVE records for the affected range. · Fixed: Red Hat build of Keycloak 26.4: 26.4.14-1 < *, 26.4-22 < *; Red Hat build of Keycloak 26.6: 26.6.5-1 < *, 26.6-11 < *
    CNA ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    keycloak-services as a component of Red Hat Data Grid 8; keycloak-services as a component of Red Hat Single Sign-On 7 · Fixed: rhbk/keycloak-operator-bundle@sha256:2c25b3107aee4f1fc25530f099fa683ba3077c185d581e7caa777c4410383085_amd64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:0d3ea94f75c1b4528722db2c216ff2267ec17ba16adf3f703afb82354f0fdc68_arm64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:330350e0cd77afca88886156c2668ae4bca75865e90362cbcf9657197bfa21e8_amd64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:399c59b8e63de5b6aa4e64008644550b98feb0957214e58dc7c6a5246dde3c87_ppc64le as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:f9f35a75d3029edf5ff82351c0b60ad0dd8672c3fa8f22f672954c248f9e0c63_s390x as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:130dfc422476647b5098a317a38964e7ea6a2a3f1a63d91f91dfb993921b356b_ppc64le as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:8a6fd6c12811ce179fc1248c63a152d173c12866b84f8b8364f4f3ed42b7ba58_s390x as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:cc475d34ac199de0908a32efa630c219469076feb74fd970d617c40cc90911f8_arm64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:fc0390f65497ad6274f3db55ac796eb792255a8780578ab4d98aec9f42c23bc0_amd64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-operator-bundle@sha256:06ee2f18c4218c9a095360efa2023b2080aa81e04a08363dbcb1d14de85a5d0d_amd64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9-operator@sha256:0024d9a0b69b61004a0d35ee25eefc443fe75ce2563b1645ec318caacc0aa23c_s390x as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9-operator@sha256:2eeef9cec3ee8e3cfdb1c4b7377582b4a5378f852e11872eeb74597ad9ec0615_amd64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9-operator@sha256:37c7d8c5b4bd9649b3da2c0929075c6bd311361667a7eb25eb3f52927b7eca8e_ppc64le as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9-operator@sha256:aadf59a1eeb8e64f2f1eea906dd1837fd144d8406b07630a3e2b0c9265c107e7_arm64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9@sha256:30a9118cf874444aabdf4dd8f84d44cb503f89d8432a652fbb0ba860d3815c4d_ppc64le as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9@sha256:7b668bfd2a9a1bd6343fb2e802912eaa72bd7043fa5be6e0a6edc06894c74b63_arm64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9@sha256:83e1c37e7e5b268c8b516f9c13d064db4fbdcd68d25a542dec0d237665b06705_amd64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9@sha256:c8203365ded9864afe84f579798eefd5f4a79ee6a4e585e47fcb0d8ea3ce959f_s390x as a component of Red Hat build of Keycloak 26.6; Red Hat build of Keycloak 26.4.14; Red Hat build of Keycloak 26.6.5
    After
    keycloak-services as a component of Red Hat Single Sign-On 7 · Fixed: rhbk/keycloak-operator-bundle@sha256:2c25b3107aee4f1fc25530f099fa683ba3077c185d581e7caa777c4410383085_amd64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:0d3ea94f75c1b4528722db2c216ff2267ec17ba16adf3f703afb82354f0fdc68_arm64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:330350e0cd77afca88886156c2668ae4bca75865e90362cbcf9657197bfa21e8_amd64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:399c59b8e63de5b6aa4e64008644550b98feb0957214e58dc7c6a5246dde3c87_ppc64le as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9-operator@sha256:f9f35a75d3029edf5ff82351c0b60ad0dd8672c3fa8f22f672954c248f9e0c63_s390x as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:130dfc422476647b5098a317a38964e7ea6a2a3f1a63d91f91dfb993921b356b_ppc64le as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:8a6fd6c12811ce179fc1248c63a152d173c12866b84f8b8364f4f3ed42b7ba58_s390x as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:cc475d34ac199de0908a32efa630c219469076feb74fd970d617c40cc90911f8_arm64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-rhel9@sha256:fc0390f65497ad6274f3db55ac796eb792255a8780578ab4d98aec9f42c23bc0_amd64 as a component of Red Hat build of Keycloak 26.4; rhbk/keycloak-operator-bundle@sha256:06ee2f18c4218c9a095360efa2023b2080aa81e04a08363dbcb1d14de85a5d0d_amd64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9-operator@sha256:0024d9a0b69b61004a0d35ee25eefc443fe75ce2563b1645ec318caacc0aa23c_s390x as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9-operator@sha256:2eeef9cec3ee8e3cfdb1c4b7377582b4a5378f852e11872eeb74597ad9ec0615_amd64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9-operator@sha256:37c7d8c5b4bd9649b3da2c0929075c6bd311361667a7eb25eb3f52927b7eca8e_ppc64le as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9-operator@sha256:aadf59a1eeb8e64f2f1eea906dd1837fd144d8406b07630a3e2b0c9265c107e7_arm64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9@sha256:30a9118cf874444aabdf4dd8f84d44cb503f89d8432a652fbb0ba860d3815c4d_ppc64le as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9@sha256:7b668bfd2a9a1bd6343fb2e802912eaa72bd7043fa5be6e0a6edc06894c74b63_arm64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9@sha256:83e1c37e7e5b268c8b516f9c13d064db4fbdcd68d25a542dec0d237665b06705_amd64 as a component of Red Hat build of Keycloak 26.6; rhbk/keycloak-rhel9@sha256:c8203365ded9864afe84f579798eefd5f4a79ee6a4e585e47fcb0d8ea3ce959f_s390x as a component of Red Hat build of Keycloak 26.6; Red Hat build of Keycloak 26.4.14; Red Hat build of Keycloak 26.6.5
    Red Hat Product Security ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-53382↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference · Red Hat RHSA-2026:50846↗Vendor advisory · Red Hat RHSA-2026:50847↗Vendor advisory · Red Hat RHSA-2026:50848↗Vendor advisory · Red Hat RHSA-2026:50849↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-16102 · cve.blacktree.nl