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CVE-2026-3121 is a privilege escalation vulnerability in Keycloak caused by improper authorization semantics in realm administration. When admin permissions are enabled at the realm level, an administrator granted the manage-clients permission can exploit a condition in which that permission becomes effectively equivalent to manage-permissions. This breaks intended privilege separation and allows the administrator to extend control beyond client management into broader realm administration. As a result, a user with only manage-clients rights can gain unauthorized control over roles, users, and other administrative functions within the realm.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
manage-clients permission in realms where admin permissions are enabled. Avoid granting manage-clients to accounts that should not have broader realm-administration influence, and limit use of realm-level admin permission configurations where possible. Monitor for unauthorized changes to roles, users, client permissions, and other administrative settings performed by delegated administrators.Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
4 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.