# Keycloak: Information disclosure of disabled user attributes via administrative endpoint

Advisory record · `GHSA-xh32-c9wx-phrp`

- **Identifiers:** `GHSA-xh32-c9wx-phrp` · `BIT-keycloak-2026-3911` · `CVE-2026-3911`
- **State:** Confirmed
- **Severity:** CVSS 2.7 Low
- **Critical:** No
- **Weakness (CWE):** [CWE-359](https://cwe.mitre.org/data/definitions/359.html)
- **Tags:** [Information disclosure](https://agentprime.io/advisories/tag/info-disclosure.md)
- **Published:** 11 Mar 2026
- **Updated:** 10 Sept 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 11 Mar 2026, 06:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `org.keycloak:keycloak-services` (Maven): affected `<=26.5.5`; no fixed version yet

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> Keycloak's keycloak-services package, versions up to and including 26.5.5, is affected. An authenticated user holding the view-users role can call a specific administrative endpoint in UserResource and retrieve user attributes that were configured to be hidden, which could expose sensitive user data. No fix is listed in the source.

Written 2 Nov 2026.

## 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

- 2.7 Low, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N`, from CNA (redhat)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0037, the 31st percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:17 UTC: First seen by agentprime
- 31 Oct 2026, 14:17 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-xh32-c9wx-phrp)

## Sources

- [GitHub Advisory Database: GHSA-xh32-c9wx-phrp](https://github.com/advisories/GHSA-xh32-c9wx-phrp)
- [OSV: GHSA-xh32-c9wx-phrp](https://osv.dev/vulnerability/GHSA-xh32-c9wx-phrp)
- <https://nvd.nist.gov/vuln/detail/CVE-2026-3911>
- <https://github.com/keycloak/keycloak/issues/46922>
- <https://github.com/keycloak/keycloak/pull/46923>
- <https://github.com/keycloak/keycloak/commit/215bc1e27230f2a66670ed70262248b5f5254eb9>
- <https://access.redhat.com/errata/RHSA-2026:6477>
- <https://access.redhat.com/errata/RHSA-2026:6478>
- <https://access.redhat.com/security/cve/CVE-2026-3911>
- <https://bugzilla.redhat.com/show_bug.cgi?id=2446392>
- <https://github.com/keycloak/keycloak>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-xh32-c9wx-phrp>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-xh32-c9wx-phrp/>. Everything for agents: <https://agentprime.io/llms.txt>.