Authentication bypass by spoofing vulnerability in Apache Syncope. (CVE-2026-87785)
Apache Syncope contains an authentication bypass vulnerability due to spoofing when JWKS settings for internal JWT authentication are disclosed. This allows an attacker who has authenticated successfully and obtained a valid JWT to spoof another user's privileges. The vulnerability affects versions from 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2. Upgrading to versions 4.0.8 or 4.1.3 resolves this issue.
AI Analysis
Technical Summary
CVE-2026-87785 is an authentication bypass vulnerability in Apache Syncope caused by the disclosure of JWKS settings used for internal JWT authentication. When these settings (at least protocol and key) are exposed, an attacker who has successfully authenticated and obtained a valid JWT can spoof another user's privileges. This affects multiple version ranges of Apache Syncope, specifically from 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2. The vendor has addressed this vulnerability in versions 4.0.8 and 4.1.3.
Potential Impact
An attacker can escalate privileges by spoofing another user's identity after successful authentication, leading to unauthorized access with potentially high confidentiality and integrity impact. The CVSS v3.1 score is 9.1 (critical), reflecting network attack vector, low attack complexity, no privileges required, no user interaction, and high confidentiality and integrity impact.
Mitigation Recommendations
Users should upgrade Apache Syncope to versions 4.0.8 or 4.1.3, which contain fixes for this vulnerability. No other mitigations are specified. Patch status is confirmed as an official fix in these versions.
Authentication bypass by spoofing vulnerability in Apache Syncope. (CVE-2026-87785)
Description
Apache Syncope contains an authentication bypass vulnerability due to spoofing when JWKS settings for internal JWT authentication are disclosed. This allows an attacker who has authenticated successfully and obtained a valid JWT to spoof another user's privileges. The vulnerability affects versions from 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2. Upgrading to versions 4.0.8 or 4.1.3 resolves this issue.
CVSS v3.1
Score 9.1critical
Affected software
pkg:maven/org.apache.syncope/syncope-coreRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-87785 is an authentication bypass vulnerability in Apache Syncope caused by the disclosure of JWKS settings used for internal JWT authentication. When these settings (at least protocol and key) are exposed, an attacker who has successfully authenticated and obtained a valid JWT can spoof another user's privileges. This affects multiple version ranges of Apache Syncope, specifically from 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2. The vendor has addressed this vulnerability in versions 4.0.8 and 4.1.3.
Potential Impact
An attacker can escalate privileges by spoofing another user's identity after successful authentication, leading to unauthorized access with potentially high confidentiality and integrity impact. The CVSS v3.1 score is 9.1 (critical), reflecting network attack vector, low attack complexity, no privileges required, no user interaction, and high confidentiality and integrity impact.
Mitigation Recommendations
Users should upgrade Apache Syncope to versions 4.0.8 or 4.1.3, which contain fixes for this vulnerability. No other mitigations are specified. Patch status is confirmed as an official fix in these versions.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-v8g7-44pf-w6m4
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-87785"]
- Database Specific Severity
- CRITICAL
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aa8a1cf55bf5e2cf5f3e92b
Added to database: 09/15/2026, 01:39:27 UTC
Last enriched: 09/15/2026, 02:02:01 UTC
Last updated: 09/15/2026, 08:01:23 UTC
Views: 4
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