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GHSA-m4j5-5x4r-2xp9

Keycloak SMTP Inject Vulnerability

Source: GitHub Advisory Database (reviewed) Moderate CVE-2025-8419

Packages

EcosystemPackageAffectedFixed in
Maven org.keycloak:keycloak-services < 26.2.8 26.2.8
Maven org.keycloak:keycloak-services >= 26.3.0, < 26.3.3 26.3.3

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.