CVE-2025-8419 Org.keycloak/keycloak-services: keycloak smtp inject vulnerability

What is CVE-2025-8419?

CVE-2025-8419 is a medium-severity vulnerability in Redhat Keycloak, published on 6 Aug 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability was found in Keycloak-services. Special characters used during e-mail registration may perform SMTP Injection and unexpectedly send short unwanted e-mails. The email is limited to 64 characters (limited local part of the email), so the attack is limited to very shorts emails (subject and little data, the example is 60 chars). This flaw's only direct consequence is an unsolicited email being sent from the Keycloak server. However, this action could be a precursor for more sophisticated attacks.

Weakness: CWE-93

Which versions are affected by CVE-2025-8419?

4 open source packages ship an affected version, including org.keycloak:keycloak-services. It affects 1 product.

Products include Redhat Keycloak.

How do I fix CVE-2025-8419?

Upgrade org.keycloak:keycloak-services to a fixed version for your release line: 26.2.8 or 26.3.3.

Is CVE-2025-8419 being exploited?

There is no known exploitation of CVE-2025-8419 in the wild and no public exploit code.

Other vulnerabilities in Redhat Keycloak

• CVE-2022-4361 Keycloak vulnerable to cross-site scripting when validating URI-schemes on SAML and OIDC Critical 10.0
• CVE-2022-1245 Keycloak vulnerable to privilege escalation on Token Exchange feature Critical 9.8
• CVE-2021-20195 keycloak Self Stored Cross-site Scripting vulnerability Critical 9.6
• CVE-2019-14910 Keycloak Authentication Error Critical 9.3
• CVE-2019-14909 Keycloak Authentication Error Critical 9.3

All Redhat Keycloak vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as ECHO-891d-8502-3521, GHSA-m4j5-5x4r-2xp9, MINI-93mx-gh4v-7rhf.