Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Keycloak Server Private SPI (org.keycloak:keycloak-server-spi-private) versions before 26.5.2 are affected. An administrator holding the manage-users permission can bypass the "Only administrators can view" setting for unmanaged user attributes and modify them, including when the configuration is meant to restrict such changes. Upgrade to version 26.5.2 or later. No workaround is listed.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 4.9 | Medium | 3.1 | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N | CNA (redhat) |
- CISA KEV Not listed.
- EPSS 0.0035, the 28th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:19 UTC First seen by agentprime
- 31 Oct 2026, 14:19 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-v4jw-m6rm-399h
- OSV: GHSA-v4jw-m6rm-399h
- nvd.nist.gov/vuln/detail/CVE-2026-0871
- github.com/keycloak/keycloak/issues/45873
- github.com/keycloak/keycloak/commit/9d0f679ecea405958f167fcd0f4a6db6ae32c3fa
- access.redhat.com/errata/RHSA-2026:2365
- access.redhat.com/errata/RHSA-2026:2366
- access.redhat.com/security/cve/CVE-2026-0871
- bugzilla.redhat.com/show_bug.cgi?id=2428881
- github.com/keycloak/keycloak