Multiple vulnerabilities in Keycloak (August 25, 2026)

unknownpublic exploitCVE-2026-15945 CVE-2026-45292 CVE-2026-15571 CVE-2026-17048 CVE-2026-59888 CVE-2026-18963

Multiple vulnerabilities have been discovered in Keycloak. They allow an attacker to cause a security policy bypass and an unspecified security issue by the publisher. CERT-FR is aware of a public proof of concept for the vulnerability...

CSIRTS triage

vendor: Keycloak product: Keycloak Authentication bypassOther

What: Multiple vulnerabilities allow security policy bypass and unspecified security issues; a public proof of concept exists.
Who is affected: Keycloak deployments, particularly those exposed to the internet.
Urgency: Unknown severity but presence of public proof of concept significantly increases exploitation risk.
Action: Prioritize patching Keycloak immediately; apply security updates for the eight disclosed CVEs and review access controls.

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

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Details

Source: CERT-FR Avis de sécurité (FR · national-cert · site)
Severity: unknown
Published: 2026-08-25
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1078/

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-2026-159450.26% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 18% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2026-452921.1% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 64% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-155710.33% 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-2026-170480.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 29% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-598880.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all EPSS-scored CVEs.
Moderate exploitation riskCVE-2026-189633.2% 30-day exploitation probability. Patch within normal cadence, watch for KEV listing. Riskier than 87% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-146130.33% 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-2026-598890.35% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 28% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-15945	coverage & exploitation status	NVD · CVE.org
CVE-2026-45292	coverage & exploitation status	NVD · CVE.org
CVE-2026-15571	coverage & exploitation status	NVD · CVE.org
CVE-2026-17048	coverage & exploitation status	NVD · CVE.org
CVE-2026-59888	coverage & exploitation status	NVD · CVE.org
CVE-2026-18963	coverage & exploitation status	NVD · CVE.org
CVE-2026-14613	coverage & exploitation status	NVD · CVE.org
CVE-2026-59889	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

medium[UPDATE] [mittel] FasterXML Jackson: Mehrere Schwachstellencert-bund
unknownexploitedNCSC-2026-0346 [1.01] [M/H] Kwetsbaarheden verholpen in Siemens productenncsc-nl
high[UPDATE] [hoch] Keycloak: Mehrere Schwachstellencert-bund
medium[NEW] [UNPATCHED] [medium] Keycloak: Multiple vulnerabilities allow information disclosurecert-bund
unknownNCSC-2026-0326 [1.00] [M/H] Kwetsbaarheden verholpen in Keycloakncsc-nl
medium[NEW] [UNPATCHED] [medium] Keycloak: Multiple vulnerabilitiescert-bund
medium[NEW] [UNPATCHED] [medium] Keycloak: Vulnerability allows information disclosurecert-bund
unknownNCSC-2026-0307 [1.00] [M/H] Vulnerabilities resolved in Oracle Database Productsncsc-nl
high[NEW] [high] Oracle Database Server: Multiple vulnerabilitiescert-bund
unknownMultiple vulnerabilities in Oracle Database Server (August 19, 2026)cert-fr-avis
highCVE-2026-15571: A flaw was found in the legacy client-initiated account-linking endpoint of Keycloak, a widely…nvd
criticalGHSA-4gv3-mc9p-5wqc: Keycloak: Unauthenticated account takeover via reset-credentials flow bypassghsa

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] [medium] Keycloak: Multiple vulnerabilitiescert-bund · 2026-08-31