CVE-2026-107121: Cleartext Transmission of Sensitive Information in Red Hat Red Hat Build of Keycloak
Description
A flaw was found in the SMTP email configuration handling of the keycloak-services component. When the STARTTLS option is enabled, Keycloak fails to strictly enforce an encrypted connection, allowing it to fall back to unencrypted communication if the encryption request is tampered with. An attacker who can intercept network traffic can exploit this to capture sensitive email credentials and message content in plain text.
CVSS v3.1
Score 6.5medium
Affected software
Red Hat
Red Hat Build of Keycloak
Red Hat
Red Hat Build of Keycloak
Red Hat
Red Hat Single Sign-On 7
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- redhat
- Date Reserved
- 2026-10-07T07:26:34.554Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Vendor Advisory Urls
- [{"url":"https://access.redhat.com/security/cve/CVE-2026-107121","vendor":"Red Hat"}]
Threat ID: 6ac5fcf72cdf04f6562a4d82
Added to database: 10/07/2026, 08:04:07 UTC
Last updated: 10/07/2026, 08:04:07 UTC
Views: 1
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