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Fencer Intel
medium 4.9

CVE-2020-14302 json

A flaw was found in Keycloak before 13.0.0 where an external identity provider, after successful authentication, redirects to a Keycloak en…

published 5y ago modified 4mo ago also EUVD-2020-6454

cvss
4.9
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 63%
public exploits
0
none known

Summary

A flaw was found in Keycloak before 13.0.0 where an external identity provider, after successful authentication, redirects to a Keycloak endpoint that accepts multiple invocations with the use of the same "state" parameter. This flaw allows a malicious user to perform replay attacks.

Patch / fix

  • redhat keycloak 13.0.0
  • rh-sso7-keycloak red hat single sign on 7 9.0.12-1.redhat_00001.1.el6sso
  • rh-sso7-keycloak-server red hat single sign on 7 9.0.12-1.redhat_00001.1.el6sso
  • rh-sso7-keycloak red hat single sign on 7 9.0.12-1.redhat_00001.1.el7sso
  • rh-sso7-keycloak-server red hat single sign on 7 9.0.12-1.redhat_00001.1.el7sso
  • rh-sso7-keycloak red hat single sign on 7 9.0.12-1.redhat_00001.1.el8sso
  • rh-sso7-keycloak-server red hat single sign on 7 9.0.12-1.redhat_00001.1.el8sso

red hat advisories RHSA-2021:0967RHSA-2021:0968RHSA-2021:0969

  • keycloak Arch Linux 13.0.0-1

arch linux advisories AVG-1926

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-14302 updated cvss 3.5

keycloak: reusable "state" parameter at redirect_uri endpoint enables possibility of replay attacks

  • Red Hat Single Sign-On 7.4 for RHEL 6 Server rh-sso7-keycloak 9.0.12-1.redhat_00001.1.el6sso, rh-sso7-keycloak-server 9.0.12-1.redhat_00001.1.el6sso
    fixed: vendor fix RHSA-2021:0967
  • Red Hat Single Sign-On 7.4 for RHEL 7 Server rh-sso7-keycloak 9.0.12-1.redhat_00001.1.el7sso, rh-sso7-keycloak-server 9.0.12-1.redhat_00001.1.el7sso
    fixed: vendor fix RHSA-2021:0968
  • Red Hat Single Sign-On 7.4 for RHEL 8 rh-sso7-keycloak 9.0.12-1.redhat_00001.1.el8sso, rh-sso7-keycloak-server 9.0.12-1.redhat_00001.1.el8sso
    fixed: vendor fix RHSA-2021:0969
  • Red Hat Single Sign-On 7.4.6
    fixed: vendor fix RHSA-2021:0974
  • Red Hat Decision Manager 7 keycloak keycloak Red Hat Fuse 7 keycloak keycloak Red Hat OpenShift Application Runtimes keycloak keycloak Red Hat Process Automation 7 keycloak keycloak Red Hat support for Spring Boot keycloak keycloak
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

1.01% chance of exploitation in the next 30 days, higher than 63% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 4.9 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:P/A:N

Affected products

  • n/a keycloak

Classification

Weakness
  • CWE-294 Authentication Bypass by Capture-replay

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.