# CVE-2026-87785

## Summary

- **CVE ID:** CVE-2026-87785
- **Severity:** CRITICAL
- **CVSS Score:** 9.1 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N)
- **CWE:** CWE-290
- **Published:** Sep 14, 2026
- **Last Modified:** Sep 14, 2026

## 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

- Apache Software Foundation — Apache Syncope (3.0.0-M0)
- Apache Software Foundation — Apache Syncope (4.0.0-M0)
- Apache Software Foundation — Apache Syncope (4.1.0-M0)

## References

- [CNA](https://lists.apache.org/thread/3t3om8mny7ng52q053pdzpmtdtosnqoo)
- [CVE](http://www.openwall.com/lists/oss-security/2026/09/14/24)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.51%
- **EPSS Percentile:** 42.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._