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.
Published: 2026-09-14
Score: 9.1 Critical
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories

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History

Mon, 14 Sep 2026 21:00:00 +0000

Type Values Removed Values Added
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 14 Sep 2026 10:45:00 +0000

Type Values Removed Values Added
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.
Title Apache Syncope: JWT subject spoofing
Weaknesses CWE-290
References

Subscriptions

No data.

cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-09-14T19:45:29.921Z

Reserved: 2026-09-09T09:19:56.813Z

Link: CVE-2026-87785

cve-icon Vulnrichment

Updated: 2026-09-14T18:09:24.963Z

cve-icon NVD

Status : Deferred

Published: 2026-09-14T11:17:05.503

Modified: 2026-09-14T20:58:48.430

Link: CVE-2026-87785

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-14T21:00:09Z

Weaknesses
  • CWE-290

    Authentication Bypass by Spoofing