CVE & CISA-KEV Catalog

CVE-2026-9704

MEDIUM
6.8
CVSS v3
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.

CWE-1284

How to fix

Remediation Available
rhbk/keycloakRed Hat / RHEL
Fixed in:rhel9@sha256:183d2a02d613de6745e0741333c4d34d8544b74866efac9237c46f26114b8c66_ppc64leRHSA-2026:30050
Fixed in:rhel9-operator@sha256:8b4788a5f7e7687f3cc98a80407057a915d516aa79ff2e879780fa13e3be738f_ppc64leRHSA-2026:30050
Fixed in:rhel9@sha256:70634542b3ae6f9c0593bd6a63d2e9fa4667c27d1cbf78c07bee4b1ebc1b6706_amd64RHSA-2026:30050
Fixed in:operator-bundle@sha256:dc6f5cde01bde313152b99cbead708160e43be14804f0ff768123fa9f54b4a4b_amd64RHSA-2026:30050
Fixed in:rhel9-operator@sha256:502c9e94ad138d062ca6e81de89284f5bcc0d27595b193498cf35f7e1bff9a40_amd64RHSA-2026:30050
Fixed in:rhel9@sha256:d94079e34e41affcb63b6094781e9e0bb0c1e15ae2f24c93ad7bf6353937ec9a_s390xRHSA-2026:30050
Fixed in:rhel9-operator@sha256:c56fdf74f5055b2ed0aa1a5706f1fe5428692aaa4d107d2081fb7c6ee7d5ace0_s390xRHSA-2026:30050
Fixed in:rhel9@sha256:05b207815e7e032115df73466875ac10436fb304bec7322e7a0a1a919901fdab_arm64RHSA-2026:30050
Fixed in:rhel9-operator@sha256:bb723943f57bf3f1b02f8b67e3aff2043b30f867dbf90155a5596b954073f57e_arm64RHSA-2026:30050
Fixed in:rhel9@sha256:acdf471dd72130f542d96f2066de14cee987d8d7c3c18eebfe7a9f6dd3ddcb8b_ppc64leRHSA-2026:25097
Fixed in:rhel9-operator@sha256:3e7730250bf4e80e6097bf585f6c56d26296abfd3a895b705fcb954fff5a6223_ppc64leRHSA-2026:25097
Fixed in:rhel9@sha256:749a914cbd258815ac1fb6ca8f6e8624c30c6b411a6f6f00f7204e6e9d053c79_arm64RHSA-2026:25097
Fixed in:rhel9-operator@sha256:091b92f4afb1a23d0fc927e4160e824237b46128ea700ceeba6a8197f2952e6f_arm64RHSA-2026:25097
Fixed in:rhel9@sha256:99222593645c093307b570651213c1695f74f7782f6922900688f8c4183d0c2c_amd64RHSA-2026:25097
Fixed in:operator-bundle@sha256:b32c3aaa65f4ea0ef5eca9ea14ba20f7a382a625acfeebf2b9f604caeaea143d_amd64RHSA-2026:25097
Fixed in:rhel9-operator@sha256:7230f239140c1e843bd0939ba086a285a183e3ed6c47b7fa72d55204f7fd5e54_amd64RHSA-2026:25097
Fixed in:rhel9@sha256:7e81ba378ddeb63a1a2fd2b85e9302a6430b44614a519e942bf410b376adc071_s390xRHSA-2026:25097
Fixed in:rhel9-operator@sha256:c71e3d3785552cb3f18bca097c7dac638fbc6e4d7af470da22b910181c0202c8_s390xRHSA-2026:25097
rhbk/keycloakRocky
Fixed in:rhel9@sha256:183d2a02d613de6745e0741333c4d34d8544b74866efac9237c46f26114b8c66_ppc64leRHSA-2026:30050
Fixed in:rhel9-operator@sha256:8b4788a5f7e7687f3cc98a80407057a915d516aa79ff2e879780fa13e3be738f_ppc64leRHSA-2026:30050
Fixed in:rhel9@sha256:70634542b3ae6f9c0593bd6a63d2e9fa4667c27d1cbf78c07bee4b1ebc1b6706_amd64RHSA-2026:30050
Fixed in:operator-bundle@sha256:dc6f5cde01bde313152b99cbead708160e43be14804f0ff768123fa9f54b4a4b_amd64RHSA-2026:30050
Fixed in:rhel9-operator@sha256:502c9e94ad138d062ca6e81de89284f5bcc0d27595b193498cf35f7e1bff9a40_amd64RHSA-2026:30050
Fixed in:rhel9@sha256:d94079e34e41affcb63b6094781e9e0bb0c1e15ae2f24c93ad7bf6353937ec9a_s390xRHSA-2026:30050
Fixed in:rhel9-operator@sha256:c56fdf74f5055b2ed0aa1a5706f1fe5428692aaa4d107d2081fb7c6ee7d5ace0_s390xRHSA-2026:30050
Fixed in:rhel9@sha256:05b207815e7e032115df73466875ac10436fb304bec7322e7a0a1a919901fdab_arm64RHSA-2026:30050
Fixed in:rhel9-operator@sha256:bb723943f57bf3f1b02f8b67e3aff2043b30f867dbf90155a5596b954073f57e_arm64RHSA-2026:30050
Fixed in:rhel9@sha256:acdf471dd72130f542d96f2066de14cee987d8d7c3c18eebfe7a9f6dd3ddcb8b_ppc64leRHSA-2026:25097
Fixed in:rhel9-operator@sha256:3e7730250bf4e80e6097bf585f6c56d26296abfd3a895b705fcb954fff5a6223_ppc64leRHSA-2026:25097
Fixed in:rhel9@sha256:749a914cbd258815ac1fb6ca8f6e8624c30c6b411a6f6f00f7204e6e9d053c79_arm64RHSA-2026:25097
Fixed in:rhel9-operator@sha256:091b92f4afb1a23d0fc927e4160e824237b46128ea700ceeba6a8197f2952e6f_arm64RHSA-2026:25097
Fixed in:rhel9@sha256:99222593645c093307b570651213c1695f74f7782f6922900688f8c4183d0c2c_amd64RHSA-2026:25097
Fixed in:operator-bundle@sha256:b32c3aaa65f4ea0ef5eca9ea14ba20f7a382a625acfeebf2b9f604caeaea143d_amd64RHSA-2026:25097
Fixed in:rhel9-operator@sha256:7230f239140c1e843bd0939ba086a285a183e3ed6c47b7fa72d55204f7fd5e54_amd64RHSA-2026:25097
Fixed in:rhel9@sha256:7e81ba378ddeb63a1a2fd2b85e9302a6430b44614a519e942bf410b376adc071_s390xRHSA-2026:25097
Fixed in:rhel9-operator@sha256:c71e3d3785552cb3f18bca097c7dac638fbc6e4d7af470da22b910181c0202c8_s390xRHSA-2026:25097

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityHigh
Privileges RequiredLow
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

Exploit Intelligence

0.32%probability of exploitation in 30 days
24thpercentile

Low risk: more likely to be exploited than 24% of all known CVEs.

References

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-26.