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No exploitation reported

CVE-2026-16102

No exploitation reported by the sources we read.

  • Published2026-08-05

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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 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.

Timeline

dates in UTC
  1. 2026-08-0515:16CVE publishedNVD

Versions per branch

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • keycloakBitnamifrom 26.4.0 · fixed in 26.4.14

Vendor advisories

  • CVE-2026-16102 Red Hat Product Security20 products fixed · 1 known affected

    keycloak-services: keycloak-services: Default DCR policy allows role forgery via User Property mappers

    keycloak-services as a component of Red Hat Single Sign-On 7

  • RHSA-2026:50849 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: Red Hat build of Keycloak 26.6.5 Images Security Update

  • RHSA-2026:50847 Red Hat Product Security9 products fixed

    Red Hat Security Advisory: Red Hat build of Keycloak 26.4.14 Images Security Update

  • RHSA-2026:50846 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat build of Keycloak 26.4.14 Security Update

  • RHSA-2026:50848 Red Hat Product Security1 product fixed

    Red Hat Security Advisory: Red Hat build of Keycloak 26.6.5 Security Update

Full record on NVD

Fix

  1. Vendor fix Red Hat Product Security RHSA-2026:50849 · 9 productsBefore applying the update, back up your existing installation, including all applications, configuration files, databases and database settings, and so on.
  2. Workaround from the vendor Red Hat Product Security RHSA-2026:50849 · 9 productsMitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
  3. No fix planned, says the vendor Red Hat Product Security CVE-2026-16102 · 1 productWill not fix

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

  • NVDCVE record2026-08-06
  • FIRST EPSSEPSS score0.5 %2026-10-22
  • OSVaffected packages—

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Published
2026-08-05
Last Modified
2026-08-06

Frequently asked questions

What is CVE-2026-16102?

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.

Is CVE-2026-16102 actively exploited?

Active exploitation of CVE-2026-16102 has not been confirmed. Its EPSS score was 0.5% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-16102?

CVE-2026-16102 has a CVSS v3 base score of 8.1 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.

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