Skip to content
Fencer Vulns
medium 5.7

CVE-2026-105302 json

Keycloak-services: keycloak-services: user session note mapper exposes upstream idp access tokens

published 2026-10-05 35 d ago modified 2026-10-06 34 d ago also EUVD-2026-92257

cvss
5.7
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits
0
none known

Summary

A flaw was found in the User Session Note mapper of the Keycloak identity and access management solution. The issue occurs because the mapper does not validate whether a requested session note contains sensitive internal credentials, such as federated access tokens from external identity providers. This allows a delegated client administrator to leak a user's upstream bearer tokens into the tokens issued to their managed application, potentially leading to unauthorized access to the user's data on external platforms.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-105302 updated cvss 5.7

keycloak-services: keycloak-services: User Session Note mapper exposes upstream IdP access tokens

  • Red Hat Build of Keycloak rhbk/keycloak-rhel9, keycloak-services 26.6.7.redhat-00003
    affected: workaround, no fix available
  • Red Hat Single Sign-On 7 keycloak-services 26.6.7.redhat-00003
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
35 d ago

Exploit prediction

0.20% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Affected products

  • Red Hat Red Hat Build of Keycloak
  • Red Hat Red Hat Single Sign-On 7

Classification

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.