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Critical · 9.1 CVE-2026-87785 EUVD-2026-77368GHSA-v8g7-44pf-w6m4

Apache Syncope: JWT subject spoofing

Published Sep 14, 2026 · Updated Sep 14, 2026 · Assigned by apache

Description

Authentication bypass by spoofing vulnerability in Apache Syncope.

When the configured JWKS settings for internal JWT authentication are disclosed (at least protocol and key), an attacker can spoof another user's privileges after completing a successful authentication and obtaining a valid JWT.

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 products

VendorProductAffectedFixed
Apache Software Foundation Apache Syncope 3.0.0-M0 – ≤ 3.0.16, 4.0.0-M0 – ≤ 4.0.7, 4.1.0-M0 – ≤ 4.1.2 —

References