[NEW] [medium] Keycloak: Multiple vulnerabilities

CSIRTS triage

What

Multiple vulnerabilities in Keycloak allow attackers to escalate privileges, bypass security measures, manipulate data, and disclose sensitive information.

Who is affected

All Keycloak deployments are affected.

Urgency

Medium severity; privilege escalation and auth bypass require timely remediation.

Action

Apply Keycloak security updates addressing CVE-2026-16105, CVE-2026-18203, CVE-2026-18206, CVE-2026-18208, CVE-2026-18209, CVE-2026-18211, CVE-2026-18214, and CVE-2026-18215.

AI-assisted analysis generated from the source advisory — verify against the original.

Details

Source

CERT-Bund (BSI) Security Advisories (DE · national-cert · site)

Severity

medium

Published

2026-08-31

Exploitation

Not in CISA KEV at last sync

Language

Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2614

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

• Low exploitation riskCVE-2026-161050.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-182030.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-182060.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-182080.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-182090.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-182110.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-182140.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-182150.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 8% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-182170.19% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-182180.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

• mediumCVE-2026-18573: A flaw was found in the keycloak-services component of Keycloak, which is used for managing au…nvd
• mediumCVE-2026-18572: Keycloak provides authorization services that allow administrators to restrict access to resou…nvd
• mediumCVE-2026-18571: A flaw was found in the user creation component of Keycloak when Fine-Grained Admin Permission…nvd
• mediumCVE-2026-18570: A flaw was found in the full-scope-disabled client-policy executor within the keycloak-service…nvd
• unknownCVE-2026-53573: GeoNetwork is a catalog application to manage spatially referenced resources. From 3.12.0 unti…nvd
• mediumGHSA-pjp7-q6wp-97qx: core-geonetwork has an Open Redirect Bypassghsa
• mediumCVE-2026-18218: A flaw was found in the TokenManager component of the Keycloak identity management service. Wh…nvd
• lowCVE-2026-18217: A flaw was found in the SAML protocol implementation of Keycloak, an open-source identity and …nvd
• mediumCVE-2026-18215: Keycloak provides a way to let users log in using Microsoft accounts while restricting access …nvd
• mediumCVE-2026-18214: Keycloak allows users to log in using Google accounts and can be configured to only allow user…nvd
• mediumCVE-2026-18211: A flaw was found in the secure-client-uris client policy executor within Keycloak core service…nvd
• lowCVE-2026-18209: A flaw was found in the keycloak-services component of Keycloak, which handles OpenID Connect …nvd

Recent advisories for Keycloak

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

• mediumCVE-2026-88770: A flaw was found in the Device Authorization Grant flow of Keycloak, an identity and access ma…nvd · 2026-09-10
• mediumCVE-2026-19729: A flaw was found in the key provider component of the keycloak-services library, which is the …nvd · 2026-09-09
• high[UPDATE] [hoch] Keycloak: Mehrere Schwachstellencert-bund · 2026-09-08
• mediumCVE-2026-82968: A flaw was found in the first-broker-login flow of the Keycloak identity management service. W…nvd · 2026-09-02
• medium[UPDATE] [medium] Keycloak (netty-codec-http): Vulnerability allows file manipulationcert-bund · 2026-09-01
• medium[NEW] [UNPATCHED] [medium] Keycloak: Multiple vulnerabilities allow bypassing of security measurescert-bund · 2026-08-31

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