---
id: CVE-2026-73191
title: >-
  URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Apache
  Syncope.






  When the Syncope SRA is configured for CAS authentication, the target Apereo
  CAS instance's URL is calculated by unconditionally looking at client-…
summary: >-
  URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Apache
  Syncope.






  When the Syncope SRA is configured for CAS authentication, the target Apereo
  CAS instance's URL is calculated by unconditionally looking at client-…
severity: medium
cvss: 6.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'
cwe:
  - CWE-601
vendor: Apache Software Foundation
product: 'org.apache.syncope:syncope-sra'
affected:
  - 'org.apache.syncope:syncope-sra >= 3.0.0-M0 <= 3.0.16'
  - 'org.apache.syncope:syncope-sra >= 4.0.0-M0 <= 4.0.7'
  - 'org.apache.syncope:syncope-sra >= 4.1.0-M0 <= 4.1.2'
published: '2026-09-14'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T20:58:48.430'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-73191'
references:
  - url: 'https://lists.apache.org/thread/vx9bons1znhdkdpsxwjpy6qqqjc8xqtk'
    label: security@apache.org
  - url: 'http://www.openwall.com/lists/oss-security/2026/09/14/5'
    label: af854a3a-2127-422b-91ae-364da2661108
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-09-14T19:32:24.226704Z'
ingestedAt: '2026-09-14T15:23:07.422Z'
epss: 0.00289
epssPercentile: 0.21705
---

## Overview

URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Apache Syncope.





When the Syncope SRA is configured for CAS authentication, the target Apereo CAS instance's URL is calculated by unconditionally looking at client-supplied forwarded HTTP headers.

This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 Through 4.0.7, from 4.1.0-M0 through 4.1.2.

Users are recommended to upgrade to version 4.0.8 / 4.1.3, which fix this issue.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.