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CVE-2026-9704 is a privilege escalation vulnerability in Keycloak's token exchange handling. An authenticated low-privilege user can submit an oversized subject_token JSON Web Token to the TokenEndpoint. When the supplied token exceeds an internal 4000-character limit, the subject_token is silently discarded instead of being rejected, and processing falls back to client credentials. As a result, the exchange can be evaluated using the client's service account context rather than the original low-privilege user context, allowing the requester to obtain permissions associated with the client service account. The flaw is rooted in improper validation and unsafe fallback behavior during token exchange processing.
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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.
3 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.