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CVE-2026-0871

Vulnerability in org.keycloak:keycloak-server-spi-private (CVE-2026-0871)

Summary

Vulnerability in org.keycloak:keycloak-server-spi-private (CVE-2026-0871). Data can be tampered with by attackers. Mitigation: upgrade to 26.5.2 or later.

Original description

The description as published by the source.

A flaw was found in Keycloak. An administrator with manage-users permission can bypass the "Only administrators can view" setting for unmanaged attributes, allowing them to modify these attributes. This improper access control can lead to unauthorized changes to user profiles, even when the system is configured to restrict such modifications.

Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV

Auto-generated summary

Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.

A vulnerability tracked as CVE-2026-0871 has been found in org.keycloak:keycloak-server-spi-private.
Data can be tampered with by attackers.
What to do: upgrade org.keycloak:keycloak-server-spi-private to 26.5.2 or later.
If unsure, ask your IT team or search "org.keycloak:keycloak-server-spi-private CVE-2026-0871" on the vendor's site.

CVE-2026-0871 (org.keycloak:keycloak-server-spi-private) — CWE-266
Attack vector: remote (network-reachable) / no user interaction
Patched: 26.5.2 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.

❓ What is the problem

A vulnerability (CWE-266) exists in org.keycloak:keycloak-server-spi-private.

📍 Affected scope

Check the vendor advisory for the affected versions of org.keycloak:keycloak-server-spi-private.

🔥 Severity

Severity: ?. Data can be tampered with by attackers.

🔧 How to fix

Update to 26.5.2.

🛡️ Workaround

Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.

🔍 Detection

Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.

Response actions

Concrete steps and command examples for SOC/SRE teams to execute in order

  1. 1
    Identify exposure identify 
    Audit SBOM/dependencies for affected components.

    資産台帳・SBOM・依存マニフェストで org.keycloak:keycloak-server-spi-private を使っているサービスとバージョンを洗い出す。

  2. 2
    Apply patch patch 
    Upgrade org.keycloak:keycloak-server-spi-private to 26.5.2

    ステージング環境で 26.5.2 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。

  3. 3
    Post-deployment verification verify 
    Confirm patched version is live in production

    パッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。

Affected packages

Maven org.keycloak:keycloak-server-spi-private
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"26.5.2"}]}]
Bitnami keycloak
[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"26.4.9"}]}]

References

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