CVE-2026-50559

HIGH 7.5

Authentication/Authorization Bypass via Advanced Path Normalization Vulnerabilities

CVSS Score

7.5

EPSS Score

0.5%

EPSS Percentile

38th

Quarkus is a Java framework for building cloud-native applications. Prior to versions 3.37.0, 3.36.3, 3.33.2.1, 3.33.3, 3.27.4.1, 3.27.5, and 3.20.6.2, Quarkus HTTP path-based authorization policies can be bypassed using encoded semicolons (%3B) to smuggle matrix parameters past the security layer, and using encoded slashes (%2F) or backslashes (%5C) to access protected static resources. This is a distinct issue from CVE-2026-39852, which addressed only literal semicolon stripping. Versions 3.37.0, 3.36.3, 3.33.2.1, 3.33.3, 3.27.4.1, 3.27.5, and 3.20.6.2 contain a patch.

CWE	CWE-287 CWE-863
Vendor	quarkusio
Product	quarkus
Published	Jun 19, 2026
Last Updated	Jul 30, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Affected Versions

quarkusio / quarkus

>= 3.36.0, < 3.36.3 >= 3.33.0, < 3.33.2.1 >= 3.27.0, < 3.27.4.1 < 3.20.6.2

References

NVD ↗ CVE.org ↗ EPSS Data ↗