CVE-2026-50559: quarkusio quarkus · Improper Authentication
Affects quarkusio quarkusSource CVE Database V5
Mentioned vulnerabilities
Public exploit available · CVSS 7.5 High · fixed in 3.36.3 : patch quarkusio quarkus as a priority.
Data as of 26 Oct 2026, 14:05 UTC
- EPSS
- 1.0% chance of exploitation in 30 days – higher than 63% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- CISA SSVC
- Exploitation
- Proof of concept is public or traded
- Automatable
- Attackers can reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-06-22.
- Patch
- Available – fixed in 3.36.3, 3.33.2.1, 3.27.4.1 +1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:NExploitation evidence
t = 0 is the CVE’s publication on cve.org
Disclosed: evidence found.
CVE published 19 Jun 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: evidence found.
CISA SSVC: proof of concept public
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
Timeline
CVE ID reserved
by GitHub, Inc.
, 15 days before disclosure
CVE published
on cve.org
, t = 0
CISA SSVC assessment
proof of concept public
, 3 days after disclosure
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), CISA SSVC, the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade quarkusio quarkus to 3.36.3, 3.33.2.1, 3.27.4.1 or 3.20.6.2.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| quarkusioquarkus | Affected
| Fixed in
|
| quarkusioquarkus | Affected
| Fixed in
|
| quarkusioquarkus | Affected
| Fixed in
|
| quarkusioquarkus | Affected
| Fixed in
|
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.
References
- github.com/quarkusio/quarkus/security/advisories/GHSA-qcxp-gm7m-4j5v (opens in a new tab)
- access.redhat.com/security/cve/CVE-2026-50559 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2486959 (opens in a new tab)
- security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-50559.json (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:48151 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:26586 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:36820 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:26194 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:26018 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:26017 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:34608 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:54435 (opens in a new tab)