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CVE-2026-97174

Red Hat build of Keycloak 26.6 · Vulnerability

CVSS 3.1 6.8 MEDIUMCheck source for fixed versionsKEV status unknown
Original advisory

cve-program · CVE-2026-97174

Published

A flaw was found in the Client-Initiated Backchannel Authentication (CIBA) implementation of Keycloak. The CIBA endpoint fails to properly validate the sub parameter, allowing it to be stored as an additional request parameter. During the token issuance process, this injected value overwrites the legitimate subject identifier. This allows an attacker to authenticate as themselves but receive security tokens belonging to a different victim user, leading to unauthorized account access.

Read the publisher's advisory

Affected versions, risk and source history

Exploitation and risk

Source status

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cve-program · CVE-2026-97174

Published

Keycloak-services: keycloak-services: ciba sub parameter injection causes attacker authentication to issue victim tokens

A flaw was found in the Client-Initiated Backchannel Authentication (CIBA) implementation of Keycloak. The CIBA endpoint fails to properly validate the sub parameter, allowing it to be stored as an additional request parameter. During the token issuance process, this injected value overwrites the legitimate subject identifier. This allows an attacker to authenticate as themselves but receive security tokens belonging to a different victim user, leading to unauthorized account access.

Source published
5 Nov 2026 17:15:54 UTC
Source modified
6 Nov 2026 17:12:36 UTC
Saved here
6 Nov 2026 19:02:40 UTC
Source terms
CVE Program Terms of Use

Original source record · Cite this exact observation · Complete original publisher JSON

Source: cve-program · CVE Program Terms of Use. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS 3.1 · 6.8 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

ChangeIntel

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Sources read 15 Nov 18:02 UTC · 254 of 275 readable · 250 fully read · documentation 469/469 current

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