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Fencer Intel
medium 5.4

CVE-2017-12158 json

Keycloak Reflected XSS

published 9y ago modified last mo. also GHSA-v38p-mqq3-m6v5 , EUVD-2022-5267

cvss
5.4
version 3.0, 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

It was found that Keycloak would accept a HOST header URL in the admin console and use it to determine web resource locations. An attacker could use this flaw against an authenticated user to attain reflected XSS via a malicious server.

Patch / fix

  • maven org.keycloak:keycloak-parent 3.4.0
  • rh-sso7-keycloak red hat single sign on 7 2.5.14-1.Final_redhat_1.1.jbcs.el7
  • rh-sso7-keycloak-server red hat single sign on 7 2.5.14-1.Final_redhat_1.1.jbcs.el7
  • rh-sso7-keycloak red hat single sign on 7 2.5.14-1.Final_redhat_1.1.jbcs.el6
  • rh-sso7-keycloak-server red hat single sign on 7 2.5.14-1.Final_redhat_1.1.jbcs.el6

red hat advisories RHSA-2017:2905RHSA-2017:2904

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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-2017-12158 updated cvss 5.4

keycloak: reflected XSS using HOST header

  • Red Hat Mobile Application Platform 4 keycloak
    affected: no fix planned “Will not fix”
  • Red Hat Single Sign-On 7.1
    fixed: vendor fix RHSA-2017:2906
  • Red Hat Single Sign-On 7.1 for RHEL 6 Server rh-sso7-keycloak 2.5.14-1.Final_redhat_1.1.jbcs.el6, rh-sso7-keycloak-server 2.5.14-1.Final_redhat_1.1.jbcs.el6
    fixed: vendor fix RHSA-2017:2904
  • Red Hat Single Sign-On 7.1 for RHEL 7 Server rh-sso7-keycloak 2.5.14-1.Final_redhat_1.1.jbcs.el7, rh-sso7-keycloak-server 2.5.14-1.Final_redhat_1.1.jbcs.el7
    fixed: vendor fix RHSA-2017:2905

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

1.02% 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 3.0 5.4 CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
NVD 2.0 3.5 AV:N/AC:M/Au:S/C:N/I:P/A:N
GitHub 3.0 5.4 CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem package affected fixed in
maven org.keycloak:keycloak-parent
<3.4.0
3.4.0

Affected products

  • Red Hat, Inc. keycloak

Classification

Weakness
  • CWE-444 Inconsistent Interpretation of HTTP Requests
  • CWE-79 Improper Neutralization of Input During Web Page Generation

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.