CVE-2026-8830
Keycloak: org.keycloak/keycloak-services: keycloak: policy bypass during webauthn credential registration via client-side javascript manipulation
- Published
- Updated
- Reserved
- Assigned by
- redhat
Description
A flaw was found in Keycloak. An authenticated user can bypass configured WebAuthn policies during credential registration by manipulating client-side JavaScript. This occurs because the server-side processAction() fails to validate that the newly created credential's parameters, such as public key algorithms, match the realm's configured WebAuthn policies. This could lead to the creation of credentials that do not adhere to administrative security requirements, potentially weakening the overall security posture of the system by allowing non-compliant authentication methods.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| redhatCNA (assigner) | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
| NVDNVD · Modified | 3.1 | Medium4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N |
- EPSS (exploitation in 30 days)
- 0.39% · top 67% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 4.3.
Weakness
Affected products
Red Hat · Red Hat build of Keycloak 26.4
- unaffected 26.4.13-1 – < *
Red Hat · Red Hat build of Keycloak 26.4
- unaffected 26.4-19 – < *
Red Hat · Red Hat build of Keycloak 26.4
- unaffected 26.4-19 – < *
Red Hat · Red Hat build of Keycloak 26.4.13
All versions: unaffected
Red Hat · Red Hat build of Keycloak 26.6
- unaffected 26.6.3-3 – < *
Red Hat · Red Hat build of Keycloak 26.6
- unaffected 26.6-6 – < *
Red Hat · Red Hat build of Keycloak 26.6
- unaffected 26.6-6 – < *
Red Hat · Red Hat build of Keycloak 26.6.3
All versions: unaffected
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Mavenorg.keycloak:keycloak-servicesGHSA-g8vr-x4qh-25qg (opens in a new tab)
What to do
Workaround: Mitigation 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.
References (6)
- RHSA-2026:25097 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:25098 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:30049 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- RHSA-2026:30050 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-8830 (opens in a new tab)vdb-entryx_refsource_REDHAT
- RHBZ#2479565 (opens in a new tab)issue-trackingx_refsource_REDHAT
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-g8vr-x4qh-25qg (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2026-8830)Record last updated .