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VulnerabilityPublished Updated

CVE-2026-107121: Cleartext Transmission

Source GCVE Database

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Authoritative record:CVE-2026-107121· Medium 6.5

Not known to be exploited · CVSS 6.5 Medium : update Red Hat build of Keycloak 26.6.8 when convenient.

Data as of 6 Nov 2026, 13:50 UTC

CVSS 3.1 base score
6.5Medium
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (redhat)CVSS 3.16.5
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 7 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Affected software

ProductAffectedFixed in
Red Hat build of Keycloak 26.6.8keycloak-servicesAffected–Fixed in–
Red Hat build of Keycloak 26.6.8rhbk/keycloak-rhel9Affected–Fixed in–
Red Hat Single Sign-On 7keycloak-servicesAffected–Fixed in–

AI-suggested

Red Hat has released an official security update in the Red Hat build of Keycloak version 26.6.8 that addresses this vulnerability. Users should apply this update promptly to ensure strict enforcement of encrypted SMTP connections when STARTTLS is enabled. No additional mitigations are indicated by the vendor advisory.

Description

A vulnerability in the SMTP email configuration handling of the keycloak-services component allows fallback from encrypted to unencrypted communication when STARTTLS is enabled. This flaw permits an attacker intercepting network traffic to capture sensitive email credentials and message content in plaintext.

References

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