CVE-2026-73178
Deferred Deferred - Pending Action

Exposure of Sensitive Information in Apache Syncope

Publication date: 2026-09-14

Last updated on: 2026-09-14

Assigner: Apache Software Foundation

Description
Exposure of Sensitive Information to an Unauthorized Actor vulnerability in Apache Syncope. An administrator with adequate entitlements can get access via REST to the list of existing Access Tokens, including their signed JWT body. These values can be then used to perform further REST requests, impersonating users with higher administration entitlements. 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.

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Meta Information

Published
2026-09-14
Last Modified
2026-09-14
Generated
2026-09-15
AI Q&A
2026-09-14
EPSS Evaluated
N/A
NVD
CVE-2026-73178
EUVD
EUVD-2026-77468

Affected Vendors & Products

Showing 5 associated CPEs
Vendor Product Version / Range
apache syncope From 3.0.0-M0 (inc) to 3.0.16 (inc)
apache syncope From 4.0.0-M0 (inc) to 4.0.7 (inc)
apache syncope From 4.1.0-M0 (inc) to 4.1.2 (inc)
apache syncope 4.0.8
apache syncope 4.1.3

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-200 The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.

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Executive Summary

This vulnerability in Apache Syncope allows an administrator with proper access to view and retrieve existing Access Tokens, including their signed JWT bodies, via REST. These tokens can then be used to make unauthorized REST requests, potentially impersonating users with higher administrative privileges.

Detection Guidance

This vulnerability allows unauthorized access to sensitive Access Tokens via REST endpoints. To detect it, monitor REST API logs for unusual access to token endpoints, especially by administrators. Check for requests to endpoints like /accessTokens or similar paths that return JWT tokens. Verify if tokens are exposed in logs or responses.

Impact Analysis

An attacker with access to these tokens could impersonate high-privilege users, leading to unauthorized actions such as data manipulation, system configuration changes, or access to sensitive information. This could result in data breaches or system compromise.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles and HIPAA's security rules. Organizations may face compliance violations, legal penalties, and reputational damage due to potential data exposure.

Mitigation Strategies

Upgrade Apache Syncope to version 4.0.8 or 4.1.3 or later to fix the vulnerability. If using versions 3.0.0-M0 through 3.0.16 or 4.0.0-M0 through 4.1.2, apply the latest patches immediately.

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