Improper Certificate Validation and Improper Validation of Certificate with Host Mismatch in KeycloakGHSA-c597-f74m-jgc2
MEDIUMGHSA-c597-f74m-jgc2 is a medium-severity (CVSS 5.9) CWE-297 vulnerability in org.keycloak:keycloak-parent. A fix is available for org.keycloak:keycloak-parent — see the affected versions and patch details below.
EPSS Exploitation Probability
Probability of exploitation in the next 30 days, from FIRST.org EPSS.
How urgent is this, really
GHSA-c597-f74m-jgc2 by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.
Where this sits among everything scored
Of 385,987 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.
Real-World Exposure
org.keycloak:keycloak-parentReal-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.
Description
A flaw was found in Keycloak in versions before 10.0.0, where it does not perform the TLS hostname verification while sending emails using the SMTP server. This flaw allows an attacker to perform a man-in-the-middle (MITM) attack.
Affected Packages
| Ecosystem | Package | Vulnerable range | Fix |
|---|---|---|---|
| ☕Maven | org.keycloak:keycloak-parent | all versions | 10.0.0org.keycloak:keycloak-parent:10.0.0 |
Affected Products
keycloakredhatopenstackredhatDetection & mitigation playbook
Open-source dependencyDetect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.keycloak:keycloak-parent, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update org.keycloak:keycloak-parent to 10.0.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-c597-f74m-jgc2 is resolved across your whole dependency graph.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.
Fixing This On Your OS
If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.
Turn off all kinds of email notifications including password reset mails.Source: Red Hat security advisory for GHSA-c597-f74m-jgc2 (CC BY 4.0)
| Product | Fixed in | Advisory |
|---|---|---|
| Red Hat Single Sign On 7.3.8 | see advisory | RHSA-2020:2112 |
| Red Hat Single Sign-On 7.3 for RHEL 6 | rh-sso7-keycloak-0:4.8.20-1.Final_redhat_00001.1.el6sso | RHSA-2020:2106 |
| Red Hat Single Sign-On 7.3 for RHEL 7 | rh-sso7-keycloak-0:4.8.20-1.Final_redhat_00001.1.el7sso | RHSA-2020:2107 |
| Red Hat Single Sign-On 7.3 for RHEL 8 | rh-sso7-keycloak-0:4.8.20-1.Final_redhat_00001.1.el8sso | RHSA-2020:2108 |
Frequently Asked Questions
Is GHSA-c597-f74m-jgc2 in your dependencies?
Find it across Maven, including transitive dependencies.