XSS in Red Hat Keycloak

CVE-2018-14655

A flaw was found in Keycloak 3.4.3.Final, 4.0.0.Beta2, 4.3.0.Final. When using 'response_mode=form_post' it is possible to inject arbitrary Javascript-Code via the 'state'-parameter in the authentication URL. This allows an XSS-Attack upon succesfully login.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.012 (64.8th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2018-14655?
CVE-2018-14655 is a medium-severity vulnerability in Red Hat Keycloak, classified under Cross-site Scripting. CVSS score: 4.6/10. Published 2018-11-13.
How severe is CVE-2018-14655?
Medium severity. CVSS v3 base score is 4.6 out of 10.
Is CVE-2018-14655 known to be exploited?
4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.