Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-hj93-h7pg-fh6v
Advisory ID github_osv/GHSA-hj93-h7pg-fh6v
Aliases CVE-2026-4282
Summary Keycloak: Privilege escalation via forged authorization codes due to SingleUseObjectProvider isolation flaw A flaw was found in Keycloak. The SingleUseObjectProvider, a global key-value store, lacks proper type and namespace isolation. This vulnerability allows an unauthenticated attacker to forge authorization codes. Successful exploitation can lead to the creation of admin-capable access tokens, resulting in privilege escalation.
Status Published
Exploitability 0.5
Weighted Severity 6.7
Risk 3.4
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-653 Improper Isolation or Compartmentalization
System Score Found at
cvssv3.1 7.4 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-hj93-h7pg-fh6v/GHSA-hj93-h7pg-fh6v.json
generic_textual HIGH
Reference id Reference type URL
https://access.redhat.com/errata/RHSA-2026:6475
https://access.redhat.com/errata/RHSA-2026:6476
https://github.com/keycloak/keycloak
https://github.com/keycloak/keycloak/commit/9046f201125a6fd6be9c116b99d348509d99d4a5
https://github.com/keycloak/keycloak/issues/47719
CVE-2026-4282 Advisory https://access.redhat.com/security/cve/CVE-2026-4282
CVE-2026-4282 https://nvd.nist.gov/vuln/detail/CVE-2026-4282
RHSA-2026:6477 Advisory https://access.redhat.com/errata/RHSA-2026:6477
RHSA-2026:6478 Advisory https://access.redhat.com/errata/RHSA-2026:6478
show_bug.cgi?id=2448061 Bug https://bugzilla.redhat.com/show_bug.cgi?id=2448061
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:H/PR:N/UI:N/S:U/C:H/I:H/A:N Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-hj93-h7pg-fh6v/GHSA-hj93-h7pg-fh6v.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:T/P:M/B:A/M:M/D:T/2026-04-02T14:23:22Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/4xxx/CVE-2026-4282.json

Source Advisory: vulnrichment/CVE-2026-4282

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

Vector: SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2026-04-02T14:23:22Z/

Decision: Track

Source URL: https://github.com/cisagov/vulnrichment/blob/develop/2026/4xxx/CVE-2026-4282.json

Source Advisory: vulnrichment/CVE-2026-4282

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