CVE-2026-73178: Apache Syncope: JWT Access Token takeover
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Apache Syncopeto a version that resolves this vulnerability.Fixed in 4.0.8 / 4.1.3
Event History
Frequently Asked Questions
Who can exploit this issue?
An administrator with adequate entitlements who can access the REST endpoint listing existing access tokens can exploit it. The exposed signed JWT bodies can be reused to impersonate users with higher administrative entitlements.
Which releases are affected and what versions fix the issue?
Affected releases are 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. Upgrade to 4.0.8 or 4.1.3 to fix the issue.