Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-hq3p-w4xv-x7vp
Advisory ID github_osv/GHSA-hq3p-w4xv-x7vp
Aliases CVE-2026-7571
Summary Keycloak: Access token disclosure and implicit flow bypass via forged client data A flaw was found in Keycloak. A low-privilege user, with knowledge of user credentials and client ID, can bypass a security control intended to disable the implicit flow in OpenID Connect (OIDC) clients. By manipulating client data during a session restart, an attacker can obtain an access token that should not be available. This vulnerability can also lead to the exposure of these access tokens in server logs, proxy logs, and HTTP Referrer headers, resulting in sensitive information disclosure.
Status Published
Exploitability 0.5
Weighted Severity 6.4
Risk 3.2
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-472 External Control of Assumed-Immutable Web Parameter
System Score Found at
cvssv3.1 7.1 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-hq3p-w4xv-x7vp/GHSA-hq3p-w4xv-x7vp.json
generic_textual HIGH
Reference id Reference type URL
https://access.redhat.com/security/cve/CVE-2026-7571
https://bugzilla.redhat.com/show_bug.cgi?id=2464263
https://github.com/keycloak/keycloak
https://github.com/keycloak/keycloak/commit/56bbfa3d8abccf39df787ae73e044a75aba1da13
https://github.com/keycloak/keycloak/issues/49110
https://github.com/keycloak/keycloak/pull/49120
https://github.com/keycloak/keycloak/releases/tag/26.6.2
CVE-2026-7571 https://nvd.nist.gov/vuln/detail/CVE-2026-7571
RHSA-2026:19596 Advisory https://access.redhat.com/errata/RHSA-2026:19596
RHSA-2026:19597 Advisory https://access.redhat.com/errata/RHSA-2026:19597
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/05/GHSA-hq3p-w4xv-x7vp/GHSA-hq3p-w4xv-x7vp.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none

Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2026-05-19T11:57:40Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/7xxx/CVE-2026-7571.json

Source Advisory: vulnrichment/CVE-2026-7571

View SSVC decision tree 
[{'Exploitation': 'none'},
 {'Automatable': 'no'},
 {'Technical Impact': 'partial'},
 {'Mission Prevalence': 'minimal'},
 {'Public Well-being Impact': 'material'},
 {'Mission & Well-being': 'medium'}]