EUVD-2026-77477
GHSA-f668-p5f8-gcxm
Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Network-reachable, no auth required, but user interaction mandatory; scope changed to browser/external CAS; low C/I only (phishing-facilitated credential theft), no availability impact.
Primary rating from Vendor (apache).
CVSS VectorVendor: apache
Lifecycle Timeline
3DescriptionCVE.org
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.
AnalysisAI
Open redirect in Apache Syncope's SRA (Secure Remote Access) component allows unauthenticated network attackers to redirect authenticated users to attacker-controlled URLs during CAS SSO login flows. The vulnerability arises because Syncope SRA unconditionally trusts client-supplied forwarded HTTP headers (e.g. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires: (1) the Syncope SRA component must be deployed and configured to use Apereo CAS authentication - instances using SAML, OIDC, or other auth mechanisms are not affected; (2) an attacker must be able to control or influence the forwarded HTTP headers reaching the SRA endpoint, either via a MITM position on the network, a misconfigured upstream proxy/load balancer that passes client-supplied Forwarded/X-Forwarded-Host headers unmodified, or by delivering a crafted URL to a victim; (3) user interaction is required - the victim must follow the redirect and interact with the attacker-controlled page. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS score of 6.1 (Medium) with vector AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N is well-calibrated for this class of vulnerability. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patches are available: upgrade Apache Syncope to version 4.0.8 (for the 4.0.x line) or 4.1.3 (for the 4.1.x line) per the Apache advisory at https://lists.apache.org/thread/vx9bons1znhdkdpsxwjpy6qqqjc8xqtk. … Detailed patch versions, workarounds, and compensating controls in full report. |
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