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How the CVE Works
The vulnerability in Keycloak-services arises due to insufficient input validation during email registration. Attackers can inject malicious SMTP commands by inserting special characters (e.g., CRLF sequences) into the email input field. When the application processes this input, it interprets these characters as SMTP command delimiters, allowing unintended email generation. The attack is constrained by a 64-character limit for the local part of the email, restricting payloads to short messages (e.g., 60-character subjects or minimal data). While the immediate impact is limited to spam-like emails, it could facilitate more advanced phishing or reconnaissance attacks.
DailyCVE Form
Platform: Keycloak-services
Version: Affects versions < 22.0.3
Vulnerability: SMTP Injection
Severity: Moderate
Date: Aug 6, 2025
Prediction: Patch expected by Aug 20, 2025
What Undercode Say
Check SMTP logs for anomalies grep "CRLF" /var/log/keycloak/smtp.log Verify input sanitization keycloak-config --validate-email-input Temporary mitigation sed -i 's/allowUnsanitizedEmails=false/true/g' /etc/keycloak.conf
How Exploit
1. Craft email with CRLF injection:
`[email protected]%0d%0aSUBJECT:Malicious%20Payload`
2. Submit during registration.
3. Server processes payload as SMTP command.
Protection from this CVE
- Update to Keycloak-services ≥ 22.0.3.
- Implement email input sanitization.
- Restrict SMTP command characters.
Impact
- Unauthorized email sending.
- Potential phishing precursor.
- Limited by payload size.
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Sources:
Reported By: github.com
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