URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Apache Syncope. (CVE-2026-73191)
Apache Syncope versions from 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2 contain an Open Redirect vulnerability when configured for CAS authentication. The vulnerability arises because the target Apereo CAS instance URL is determined by untrusted client-supplied forwarded HTTP headers. This can lead to URL redirection to untrusted sites. Fixed versions 4.0.8 and 4.1.3 address this issue.
AI Analysis
Technical Summary
The vulnerability in Apache Syncope involves improper handling of client-supplied forwarded HTTP headers when the Syncope SRA is configured for CAS authentication. The application calculates the target Apereo CAS instance's URL without validating these headers, leading to an Open Redirect vulnerability (CWE-601). This affects multiple version ranges: from 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2. The issue is fixed in versions 4.0.8 and 4.1.3.
Potential Impact
An attacker could exploit this vulnerability to redirect users to untrusted external websites by manipulating forwarded HTTP headers. This may lead to phishing or other social engineering attacks, potentially compromising user trust and security. The CVSS 3.1 score is 6.1 (medium severity), indicating a moderate impact with low confidentiality and integrity impact but no availability impact.
Mitigation Recommendations
Users should upgrade Apache Syncope to versions 4.0.8 or 4.1.3, which contain fixes for this vulnerability. No other mitigation or temporary workaround is indicated in the provided data. Patch status is confirmed by the vendor advisory information.
URL Redirection to Untrusted Site ('Open Redirect') vulnerability in Apache Syncope. (CVE-2026-73191)
Description
Apache Syncope versions from 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2 contain an Open Redirect vulnerability when configured for CAS authentication. The vulnerability arises because the target Apereo CAS instance URL is determined by untrusted client-supplied forwarded HTTP headers. This can lead to URL redirection to untrusted sites. Fixed versions 4.0.8 and 4.1.3 address this issue.
CVSS v3.1
Score 6.1medium
Affected software
pkg:maven/org.apache.syncope/syncope-coreRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Apache Syncope involves improper handling of client-supplied forwarded HTTP headers when the Syncope SRA is configured for CAS authentication. The application calculates the target Apereo CAS instance's URL without validating these headers, leading to an Open Redirect vulnerability (CWE-601). This affects multiple version ranges: from 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2. The issue is fixed in versions 4.0.8 and 4.1.3.
Potential Impact
An attacker could exploit this vulnerability to redirect users to untrusted external websites by manipulating forwarded HTTP headers. This may lead to phishing or other social engineering attacks, potentially compromising user trust and security. The CVSS 3.1 score is 6.1 (medium severity), indicating a moderate impact with low confidentiality and integrity impact but no availability impact.
Mitigation Recommendations
Users should upgrade Apache Syncope to versions 4.0.8 or 4.1.3, which contain fixes for this vulnerability. No other mitigation or temporary workaround is indicated in the provided data. Patch status is confirmed by the vendor advisory information.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-f668-p5f8-gcxm
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-73191"]
- Database Specific Severity
- MODERATE
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aa8a1d055bf5e2cf5f3e937
Added to database: 09/15/2026, 01:39:28 UTC
Last enriched: 09/15/2026, 02:02:50 UTC
Last updated: 09/15/2026, 10:01:24 UTC
Views: 4
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