CVE-2026-16108: Keycloak-services: keycloak-services: realm default-group reads disclose hidden groups under fgap v2
Telemetry drift only. No threshold crossed and no authority ruling changed.
CVE record, CISA KEV and EPSS as of 2026-10-18.
CVEs like this one computed, by meaning
What to do now held facts and links
- No fix version is held. The CNA's first reference is the place to look: access.redhat.com
- Record your decision, dated and frozen with today's evidence: patch by a date · mitigated by a compensating control · deferred · accepted the risk · not affected
- Check your version against the ranges this record publishes.
What it is stated by the CNA
A flaw was found in the default-groups REST endpoint and realm representation of Keycloak. This component is responsible for managing groups that are automatically assigned to new users within a realm. The issue allows a delegated administrator with realm-viewing permissions to see the names and identifiers of hidden default groups, even if they lack the specific permissions to view those groups. This can lead to the exposure of sensitive organizational structures or internal group names.
- weakness
- CWE-1220 Insufficient Granularity of Access Control
- affected
- Red Hat build of Keycloak 26.6; Red Hat build of Keycloak 26.6.7; Red Hat Data Grid 8; Red Hat JBoss Enterprise Application Platform Expansion Pack; Red Hat Single Sign-On 7
- versions
- No affected-version range in held sources.
- fixed in
- No fix version in held sources.
- fixed by package (from OSV advisories)
- keycloak (Bitnami): 26.7.3 BIT-keycloak-2026-16108
- severity
- 4.3 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
- assigned by
- redhat
- published
- 2026-07-17
check us access.redhat.com access.redhat.com access.redhat.com bugzilla.redhat.com
Exploit code held, dated
- exploit code
- None held in the PoC-in-GitHub feed. A public repository changes this brief.
What moved held, dated
| date | EPSS | event |
|---|---|---|
| 18 Jul 2026 | 0.00183 | |
| 7 Aug 2026 | 0.00194 | |
| 31 Aug 2026 | 0.00174 | |
| 17 Sep 2026 | 0.00212 | |
| 28 Sep 2026 | 0.0037 |
5 observations held. A step marked with a scoring model moved because the measurement was replaced, not because the vulnerability changed.
Outside the record researched, cited
This section reads the record's references and adds cited findings from outside it. It needs an account. Everything above is held facts and is complete without it.
What would change this brief held, dated
- CISA KEV
- Not listed in the catalogue we hold. A listing changes this brief.
- exploit probability
- 0.00 on 2026-09-28 (FIRST's EPSS, a probability and not evidence of exploitation). Next band line: 10% (0.10). Crossing a line changes this brief.
- fix
- No fix version is held. One published by the CNA or OSV changes this brief.
How to check this
Every value above is held with two dates: when it was true upstream (as_of) and when we recorded it (tx_from). Re-derive the exploit probability as it stood on any date:
SELECT value, source, source_version, as_of, tx_from
FROM volatile_valid_as_of('CVE-2026-16108', '2026-10-31T23:59:59.999999Z', now());