Advisoriesby IbisRed HatCVE-2026-107121
Red Hat build of Keycloak 26.6.8: cleartext transmission
No fix yet
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.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Red Hat Single Sign-On 7 Product | all versions | No fix yet |
| Red Hat build of Keycloak 26.6.8 Product | all versions | No fix yet |
| all versions | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-319