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  4. CVE 2026 107889 keycloak services keycloak services stored xss on
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Back to active CVEs
Medium · CVSS 5.5CVE-2026-107889

Keycloak-services: keycloak-services: stored xss on login page via kcsanitize bypassCVE-2026-107889

Answer in brief

CVE-2026-107889 records a Medium severity (CVSS 5.5) vulnerability in Keycloak-services: keycloak-services: stored xss on login page via kcsanitize bypass. The current sources do not mark it as known exploited. The current feed maps Red Hat/keycloak-services (generic), Red Hat/rhbk/keycloak-rhel9 (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 9, 2026Updated Oct 9, 2026Source checked Oct 9, 2026First seen by HOL Oct 9, 2026Material review Oct 9, 2026
Upstream Advisory

Key facts

Risk
Medium · CVSS 5.5
Exploitation
Not marked as known exploited
Affected software
2 mapped packages or products
Fix availability
Not reported

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Red Hat/keycloak-services (generic), Red Hat/rhbk/keycloak-rhel9 (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Red Hat/keycloak-servicesgeneric*Not reported
Red Hat/rhbk/keycloak-rhel9generic*Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Red Hat/keycloak-services, Red Hat/rhbk/keycloak-rhel9.
  2. 2Review the reported fix. Source-reported workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

Evidence timeline and material changes

  1. Published upstream

    Oct 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 9, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 9, 2026

Sources and claim methodology

  • Source referenceaccess.redhat.com
  • Source referencebugzilla.redhat.com
Upstream source description

A flaw was found in the login theme rendering component of Keycloak. The issue occurs because the security filter responsible for cleaning user input can be bypassed, allowing a realm administrator to store malicious scripts in display fields. This could result in unauthorized JavaScript execution in the browsers of users visiting the login page, potentially leading to data exposure or session interference.

Quoted source text, attributed separately from HOL analysis.

Related CVEs

  • Reset context tracking on consecutive template expressions in html/templateAlso CWE-79
  • Recognize yield as regexp preceder keyword in html/templateAlso CWE-79
  • Unauthenticated JSON API Authorization Bypass Vulnerability in TP-Link Tapo C325WBSame generic ecosystem
  • Unauthenticated RTSP Tunnel Denial-of-Service Vulnerability in TP-Link Tapo C325WBSame generic ecosystem
  • Predictable Media Stream Pre-Shared Key Vulnerability in TP-Link Tapo C325WBSame generic ecosystem
  • Eog: eog: arbitrary code execution via heap buffer overflow in png metadata readerSame generic ecosystem

Record context

Vulnerability class
XSS
EPSS
Not reported
CWE IDs
CWE-79
Source
CVE List V5
Source checked
Oct 9, 2026
References
2 linked sources
Open source record