CVE-2026-87785
Apache Syncope: JWT subject spoofing
CVSS Score
9.1
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-290 |
| Vendor | apache software foundation |
| Product | apache syncope |
| Published | Sep 14, 2026 |
| Last Updated | Sep 14, 2026 |
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Affected Versions
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
Credits
Alon Galili