[UPDATE] [medium] Keycloak: Multiple vulnerabilities

CSIRTS triage

What

An attacker can exploit multiple vulnerabilities in Keycloak to escalate privileges, disclose information, bypass security measures, and conduct a Denial of Service attack.

Who is affected

Deployments of Keycloak with the affected versions.

Urgency

Remediation is urgent due to the potential for privilege escalation and denial of service.

Action

Update to the latest version of Keycloak.

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

2026-08-19

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-2026-1708

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-2026-96890.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-97040.32% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-97910.21% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-97920.27% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-97930.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-97940.33% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 26% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-97950.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-97960.22% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 12% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-97980.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 27% of all EPSS-scored CVEs.
• Low exploitation riskCVE-2026-98010.48% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 39% of all EPSS-scored CVEs.

Referenced CVEs

Same CVEs, other sources

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

• unknownMultiple vulnerabilities in KeyCloak (June 29, 2026)cert-fr-avis
• mediumGHSA-q6h7-xxp7-7429: Keycloak has an Authentication Bypass by Primary Weaknessghsa
• mediumGHSA-p3v8-fm5p-v84h: Keycloak has an Improper Verification of Cryptographic Signature issueghsa
• mediumGHSA-pq65-77rc-7r8c: Keycloak has a Time-of-check Time-of-use (TOCTOU) Race Conditionghsa
• mediumGHSA-wcvj-vpvw-9rr5: Keycloak Services has Improper Validation of Consistency within Inputghsa

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.

• unknownNCSC-2026-0326 [1.00] [M/H] Vulnerabilities patched in Keycloakncsc-nl · 2026-08-25
• mediumCVE-2026-79652: A flaw was found in the JWT Bearer authorization grant implementation within the keycloak-serv…nvd · 2026-08-25
• high[NEW] [high] Keycloak: Multiple vulnerabilitiescert-bund · 2026-08-25
• unknownMultiple vulnerabilities in Keycloak (August 25, 2026)cert-fr-avis · 2026-08-25
• mediumCVE-2025-68833: HCL Hive Keycloak IAM Instance is affected by insufficient granularity of access control which…nvd · 2026-08-24
• medium[NEW] [UNPATCHED] [medium] Keycloak: Multiple vulnerabilitiescert-bund · 2026-08-19

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