Exploitation ongoing with high activity in latest observed window (1 mentions)
Recommended action window: Immediate (within 24h)
NVD description
A flaw was found in Keycloak. An authenticated user with low privileges can exploit this vulnerability by sending an oversized subject_token JSON Web Token (JWT) to the TokenEndpoint. When the token exceeds a 4000-character limit, it is silently dropped, causing the system to fall back to client credentials. This allows the user to gain the permissions of the client's service account, leading to privilege escalation.
Priority
LOW
Exploitation
ACTIVE
PoC
NONE
Patch
NONE
Momentum
NONE
If you run products in this scope, you should treat this CVE as relevant to your environment.
1 version affected across 1 product
Our CTI team identified a lot of activities targeting Keycloak (CVE-2026-9704) https://vuldb.com/vuln/366455/cti
Post summary
The CTI team reports numerous observed attacks against Keycloak involving CVE‑2026‑9704, indicating active exploitation but no explicit PoC, exploit code, or patch details.
1 of 1 entries
| Part | Vendor | Product | Version | Target SW | Target HW |
|---|---|---|---|---|---|
| App | redhat | build_of_keycloak | - | - | - |