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CVE-2026-50559

Quarkus authentication bypass

7.5 HIGHPublic exploitEPSS 1.02%
  1. Published19 Jun 2026

Description

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected products

Quarkus≥ 3.21.0 < 3.27.4.1 · ≥ 3.28.0 < 3.33.2.1 · ≥ 3.34.0 < 3.36.3 · < 3.20.6.2

Remediation

Fixed in
Quarkus≥ 3.27.4.1

References

and 2 more references

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Frequently asked

Is CVE-2026-50559 being actively exploited?

CVE-2026-50559 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 1.02%.

How severe is CVE-2026-50559?

CVE-2026-50559 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 1.02% probability of exploitation.

Which products are affected by CVE-2026-50559?

Affected products include Quarkus.

How do I fix CVE-2026-50559?

Upgrade affected software to a fixed version, for example Quarkus 3.27.4.1 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-50559 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.