CVE-2026-15573: A flaw was found in Keycloak's Authorization Services. The component responsible for matching request paths to security policies (PathMatcher) does not properly normalize URIs befo
A flaw was found in Keycloak's Authorization Services. The component responsible for matching request paths to security policies (PathMatcher) does not properly normalize URIs before comparison. By adding extra characters like a trailing slash or matrix parameters to a URL, an attacker can trick the system into applying a less restrictive security policy than intended. This allows an authenticated user to access administrative or restricted areas they should not have permission to see.
Details
Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-15573
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-2026-155730.29% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 21% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-15573 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- high[NEW] [high] RedHat Build of Keycloak: Multiple Vulnerabilitiescert-bund
- unknownMultiple vulnerabilities in KeyCloak (August 6, 2026)cert-fr-avis
Recent advisories for Keycloak's Authorization Services
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-2026-18573: A flaw was found in the keycloak-services component of Keycloak, which is used for managing au…nvd · 2026-08-02
- mediumCVE-2026-18572: Keycloak provides authorization services that allow administrators to restrict access to resou…nvd · 2026-08-02
- mediumCVE-2026-16089: A flaw was found in the keycloak-services component of Red Hat Build of Keycloak. The issue oc…nvd · 2026-07-17
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