CVE-2026-78330

Apache Syncope: Privilege escalation for admin user via JWT authentication

State: Published
Severity: 9.8 Critical
Published: Sep 14, 2026
Updated: Sep 14, 2026
Reserved: Aug 24, 2026

Description

Incorrect privilege assignment vulnerability in Apache Syncope.

When the configured JWKS settings for internal JWT authentication are disclosed (at least protocol and key), an attacker can obtain admin privileges after completing a successful authentication and obtaining a valid low-privileges 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.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	CISA-ADP

Weaknesses

CWE-266 Incorrect privilege assignment

Affected Products

Product	Versions
Apache SyncopeApache Software Foundation	3.0.0-M0 through 3.0.16Affected 4.0.0-M0 through 4.0.7Affected 4.1.0-M0 through 4.1.2Affected

References

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