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A vulnerability in Keycloak's first-broker-login flow allows cross-session verification proof to be reused across different upstream identities from the same identity provider. The verification proof is keyed only by the local user identifier and the identity provider alias, and is not bound to the specific upstream identity that completed verification. As a result, after one upstream account is verified for a given local account and identity provider, a second upstream account on that same provider can consume the proof and become linked to the victim's local account. This is an identity binding flaw in the account-linking process that can enable unauthorized association of an attacker-controlled federated identity with another user's local Keycloak account.
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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.
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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.
2 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.