Staging Environment: Content and features may be unstable or change without notice.
Search for vulnerabilities
Vulnerability details: VCID-xy58-u3se-wfdb
Vulnerability ID VCID-xy58-u3se-wfdb
Aliases CVE-2023-0264
GHSA-9g98-5mj6-f9mv
GMS-2023-573
Summary Keycloak vulnerable to user impersonation via stolen UUID code Keycloak's OpenID Connect user authentication was found to incorrectly authenticate requests. An authenticated attacker who could also obtain a certain piece of info from a user request, from a victim within the same realm, could use that data to impersonate the victim and generate new session tokens.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (5)
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-287 Improper Authentication
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
CWE-345 Insufficient Verification of Data Authenticity
CWE-303 Incorrect Implementation of Authentication Algorithm
System Score Found at
cvssv3 4.6 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-0264.json
cvssv3.1 8.7 https://access.redhat.com/security/cve/CVE-2023-0264
generic_textual HIGH https://access.redhat.com/security/cve/CVE-2023-0264
epss 0.03942 https://api.first.org/data/v1/epss?cve=CVE-2023-0264
epss 0.03942 https://api.first.org/data/v1/epss?cve=CVE-2023-0264
epss 0.03942 https://api.first.org/data/v1/epss?cve=CVE-2023-0264
epss 0.03942 https://api.first.org/data/v1/epss?cve=CVE-2023-0264
epss 0.03942 https://api.first.org/data/v1/epss?cve=CVE-2023-0264
epss 0.03942 https://api.first.org/data/v1/epss?cve=CVE-2023-0264
epss 0.03942 https://api.first.org/data/v1/epss?cve=CVE-2023-0264
epss 0.03942 https://api.first.org/data/v1/epss?cve=CVE-2023-0264
epss 0.03942 https://api.first.org/data/v1/epss?cve=CVE-2023-0264
epss 0.03942 https://api.first.org/data/v1/epss?cve=CVE-2023-0264
epss 0.04047 https://api.first.org/data/v1/epss?cve=CVE-2023-0264
epss 0.04047 https://api.first.org/data/v1/epss?cve=CVE-2023-0264
epss 0.04047 https://api.first.org/data/v1/epss?cve=CVE-2023-0264
cvssv3.1_qr HIGH https://github.com/advisories/GHSA-9g98-5mj6-f9mv
cvssv3.1 8.7 https://github.com/keycloak/keycloak
generic_textual HIGH https://github.com/keycloak/keycloak
cvssv3.1 8.7 https://github.com/keycloak/keycloak/commit/ec8109112e67208c13e13f6d1f8706a5a3ba8d4c
generic_textual HIGH https://github.com/keycloak/keycloak/commit/ec8109112e67208c13e13f6d1f8706a5a3ba8d4c
cvssv3.1 8.7 https://github.com/keycloak/keycloak/security/advisories/GHSA-9g98-5mj6-f9mv
cvssv3.1_qr HIGH https://github.com/keycloak/keycloak/security/advisories/GHSA-9g98-5mj6-f9mv
generic_textual HIGH https://github.com/keycloak/keycloak/security/advisories/GHSA-9g98-5mj6-f9mv
cvssv3.1 8.7 https://nvd.nist.gov/vuln/detail/CVE-2023-0264
generic_textual HIGH https://nvd.nist.gov/vuln/detail/CVE-2023-0264
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-0264.json
https://access.redhat.com/security/cve/CVE-2023-0264
https://api.first.org/data/v1/epss?cve=CVE-2023-0264
https://github.com/keycloak/keycloak
https://github.com/keycloak/keycloak/commit/ec8109112e67208c13e13f6d1f8706a5a3ba8d4c
https://nvd.nist.gov/vuln/detail/CVE-2023-0264
2160585 https://bugzilla.redhat.com/show_bug.cgi?id=2160585
GHSA-9g98-5mj6-f9mv https://github.com/advisories/GHSA-9g98-5mj6-f9mv
GHSA-9g98-5mj6-f9mv https://github.com/keycloak/keycloak/security/advisories/GHSA-9g98-5mj6-f9mv
No exploits are available.
Vector: CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2023-0264.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: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N Found at https://access.redhat.com/security/cve/CVE-2023-0264
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: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N Found at https://github.com/keycloak/keycloak
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: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N Found at https://github.com/keycloak/keycloak/commit/ec8109112e67208c13e13f6d1f8706a5a3ba8d4c
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: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N Found at https://github.com/keycloak/keycloak/security/advisories/GHSA-9g98-5mj6-f9mv
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: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N Found at https://nvd.nist.gov/vuln/detail/CVE-2023-0264
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
Exploit Prediction Scoring System (EPSS)
Percentile 0.88299
EPSS Score 0.03942
Published At April 2, 2026, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2026-04-01T12:51:39.709589+00:00 GitLab Importer Import https://gitlab.com/gitlab-org/advisories-community/-/blob/main/maven/org.keycloak/keycloak-services/GMS-2023-573.yml 38.0.0