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.
Analysis
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Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Apache Software Foundation | Apache Syncope | unaffected |
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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 |
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Subscriptions
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MITRE
Status: PUBLISHED
Assigner: apache
Published:
Updated: 2026-09-14T10:38:12.389Z
Reserved: 2026-09-09T09:19:56.813Z
Link: CVE-2026-87785
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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CWE-290
Authentication Bypass by Spoofing