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CVE-2026-109082

Status: Awaiting AnalysisMedium (6.8)—
Severity6.8Medium · CVSS 3.1
Exploitation probability0.25 %higher than 15% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

A flaw was found in the Client-Initiated Backchannel Authentication CIBA implementation within the keycloak-services component of Keycloak. This component handles advanced authentication flows where a client initiates a login on behalf of a user. The issue occurs because Keycloak fails to verify that a client is authorized to use the CIBA flow, allowing public clients to bypass security requirements. An attacker could use this flaw to trick a user into approving a login request, eventually gaining full access to the users account without needing a client secret.

CVSS

Base score
6.8
Version
3.1
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
0.25 %
Percentile among all scored CVEs
15
Score date
10/24/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Vector CVSS con UI:R (interacción del usuario) indica ejecución en el cliente (T1203). El atacante engaña al usuario para que apruebe un login, obteniendo acceso a cuenta (T1078) y potencial control de la identidad (T1556).

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

ATT&CK mitigations that cover these techniques

User Account ManagementPrivileged Account ManagementPassword PoliciesMulti-factor AuthenticationApplication Developer GuidanceActive Directory Configuration

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Keycloak — KeycloakAI

CWEs

References

Show 2 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-109082",
  "cveTags": [],
  "metrics": {
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        "ssvcData": {
          "id": "CVE-2026-109082",
          "role": "CISA Coordinator",
          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "no"
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            {
              "technicalImpact": "total"
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          ],
          "version": "2.0.3",
          "timestamp": "2026-10-15T13:11:52.777242Z"
        }
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          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N",
          "integrityImpact": "HIGH",
          "userInteraction": "REQUIRED",
          "attackComplexity": "HIGH",
          "availabilityImpact": "NONE",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "HIGH"
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        "impactScore": 5.2,
        "exploitabilityScore": 1.6
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        {
          "cpes": [
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          "packageName": "keycloak-services",
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          "product": "Red Hat Single Sign-On 7",
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  "published": "2026-10-12T07:16:36.303",
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      "url": "https://access.redhat.com/security/cve/CVE-2026-109082",
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      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2549478",
      "source": "secalert@redhat.com"
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  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
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      "source": "secalert@redhat.com",
      "description": [
        {
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    {
      "lang": "en",
      "value": "A flaw was found in the Client-Initiated Backchannel Authentication CIBA implementation within the keycloak-services component of Keycloak. This component handles advanced authentication flows where a client initiates a login on behalf of a user. The issue occurs because Keycloak fails to verify that a client is authorized to use the CIBA flow, allowing public clients to bypass security requirements. An attacker could use this flaw to trick a user into approving a login request, eventually gaining full access to the users account without needing a client secret."
    }
  ],
  "lastModified": "2026-10-15T16:33:26.290",
  "sourceIdentifier": "secalert@redhat.com"
}