SMTP Injection Vulnerability in Keycloak Services
CVE-2025-8419

5.3MEDIUM

Key Information:

Vendor

Keycloak

Status
Keycloak
Red Hat Build Of Keycloak 26.0
Red Hat Build Of Keycloak 26.2
Vendor
CVE Published:
6 August 2025

What is CVE-2025-8419?

A vulnerability in Keycloak Services allows for SMTP injection during email registration. This issue arises from the handling of special characters, permitting an attacker to send unsolicited short emails from the Keycloak server. The attack is limited to emails with 64 characters or fewer, restricting the potential damage to brief messages containing minimal information. While the immediate consequence is the unintended dispatch of emails, this vulnerability could serve as a foothold for more advanced attacks in the future.

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Deploy the Patch

Affected Version(s)

keycloak 0 < 26.3.3

Red Hat build of Keycloak 26.0 26.0.15-1

Red Hat build of Keycloak 26.0 26.0-18

References

https://access.redhat.com/errata/RHSA-2025:15336
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:15337
vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2025:15338
vendor-advisoryx_refsource_REDHAT

CVSS V3.1

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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