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CVE-2026-107121— Keycloak-services: keycloak-services: smtp starttls plaintext credential and message downgrade

Quick assessment

Affected
Red Hat Red Hat Build of Keycloak
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 keycloak-services 组件的 SMTP 电子邮件配置处理中发现了漏洞。当启用 STARTTLS 选项时，Keycloak 未能严格强制使用加密连接，如果加密请求被篡改，则可能回退到未加密的通信。能够通过拦截网络流量的攻击者可以利用此漏洞，以明文形式捕获敏感的电子邮件凭证和消息内容。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-107121

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: smtp starttls plaintext credential and message downgrade
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文传输
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Build of Keycloak - cpe:/a:redhat:build_keycloak:
Red Hat Red Hat Build of Keycloak - cpe:/a:redhat:build_keycloak:
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-107121

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III. Intelligence Information for CVE-2026-107121

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Other References for CVE-2026-107121 (2)

Same Patch Batch · Red Hat · 2026-10-07 · 6 CVEs total

CVE-2026-106471 8.1 HIGH Candlepin: candlepin: broken object-level authorization via verifyauthorizationfilter mult
CVE-2026-103869 6.5 MEDIUM Pulp-ansible: bearer tokens are reused across remotes in a worker
CVE-2026-103868 6.5 MEDIUM Pulp-container: registry credentials are reused across remotes in a worker
CVE-2026-106061 5.5 MEDIUM Gimp: gimp: heap buffer over-read in x cursor (xmc) thumbnail loader on crafted file
CVE-2026-103870 5.0 MEDIUM Pulp-rpm: distribution tree publish creates directories from .treeinfo ids

IV. Related Vulnerabilities

Same product: Red Hat Build of Keycloak
Same vendor: Red Hat
Same weakness: CWE-319

V. Comments for CVE-2026-107121

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