9.1

CVE-2026-87785

Apache Syncope: JWT subject spoofing

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerApache Software Foundation
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Produkt Apache Syncope
Default Statusunaffected
Version <= 3.0.16
Version 3.0.0-M0
Status affected
Version <= 4.0.7
Version 4.0.0-M0
Status affected
Version <= 4.1.2
Version 4.1.0-M0
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.51% 0.422
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
CISA-ADP 9.1 3.9 5.2
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CWE-290 Authentication Bypass by Spoofing

This attack-focused weakness is caused by incorrectly implemented authentication schemes that are subject to spoofing attacks.

https://lists.apache.org/thread/3t3om8mny7ng52q053pdzpmtdtosnqoo
http://www.openwall.com/lists/oss-security/2026/09/14/24