CVE•Published 2026-05-27•Modified 2026-06-03•0 articles on news•5 live references•NVD data
CVE-2026-9704Redhat · Build_of_keycloak
Vulnerability data via NVD (ingested)
CVSS v3.1
6.8
MEDIUM
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
EPSS percentile
—
Weaknesses (CWE)
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.
Timeline
Published 2026-05-27
Modified 2026-06-03
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2026-9704Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Redhat Build Of Keycloak"All exposed Redhat Build Of Keycloak instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Build Of Keycloak"HTTP body or banner mentions "Build Of Keycloak" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2026-9704Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2026-9704Censys host search filtered to this CVE id.
grep.app
CVE-2026-9704Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2026-9704GitHub code search for direct mentions.
Google dork
"CVE-2026-9704" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.
Known PoCs on GitHub (1)
We haven't classified any articles referencing CVE-2026-9704 yet. The external references above still apply.