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Advisory details: vulnrichment / CVE-2026-7571
Advisory ID vulnrichment/CVE-2026-7571
Aliases
Summary 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 0.0
Risk
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
ssvc Track
Reference id Reference type URL
https://access.redhat.com/security/cve/CVE-2026-7571
https://bugzilla.redhat.com/show_bug.cgi?id=2464263
cpe:/a:redhat:build_keycloak:26.4::el9 Other https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:/a:redhat:build_keycloak:26.4::el9
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 None
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/ Found at 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'}]