Medium [CVE-2025-8419] keycloak smtp inject vulnerability
This medium-severity Red Hat Linux advisory covers CVE-2025-8419 affecting Red Hat build of Keycloak 26.0, Red Hat build of Keycloak 26.2.
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Summary
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.
Affected products named by the advisory: Red Hat build of Keycloak 26.0; Red Hat build of Keycloak 26.2.
- keycloak before 26.3.3
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- 26.3.3
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation
Upgrade to a fixed release: 26.3.3. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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