CVE-2026-73191

Apache Syncope: CAS service URL injection via Forwarded HTTP headers

Published Sep 14, 2026 CVSS 3.1 · 6.1 Medium EPSS < 1% KEV · Not listed
Description
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

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Apache
Apache syncope
Vendors & Products Apache
Apache syncope
References
Metrics cvssV3_1

{'score': 6.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description 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.
Title Apache Syncope: CAS service URL injection via Forwarded HTTP headers
Weaknesses CWE-601
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Sep 14, 2026, 7:32 PM
Reserved
Aug 11, 2026, 11:03 AM
Status
Deferred
Published
Sep 14, 2026, 2:17 PM
Modified
Sep 14, 2026, 8:58 PM