CVE-2026-87785— Apache Syncope: JWT subject spoofing
Quick assessment
Affected
Apache Software Foundation Apache Syncope
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Apache Syncope 中通过欺骗实现的认证绕过漏洞。 当内部 JWT 认证所配置的 JWKS 设置（至少包括协议和密钥）被泄露时，攻击者在完成一次成功的认证并获取有效 JWT 后，可以模仿其他用户的权限。 该问题影响 Apache Syncope 的以下版本：3.0.0-M0 至 3.0.16、4.0.0-M0 至 4.0.7、4.1.0-M0 至 4.1.2。 建议用户升级到 4.0.8 或 4.1.3 版本，这些版本已修复此问题。
Possible ATT&CK Techniques 1 AI
T1555.005 · Password Managers
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I. Basic Information for CVE-2026-87785
Vulnerability Information
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Vulnerability Title
Apache Syncope: JWT subject spoofing
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Apache Software Foundation | Apache Syncope | 3.0.0-M0 ~ 3.0.16 | - |
|
II. Public POCs for CVE-2026-87785
| # | POC Description | Source Link | Shenlong Link |
|---|
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Mailing List Discussions for CVE-2026-87785 (1)
Same Patch Batch · Apache Software Foundation · 2026-09-14 · 20 CVEs total
| CVE-2026-77883 | Apache Syncope: Information disclosure via one-hop JEXL navigation past the JexlContextBui | |
| CVE-2026-72524 | Apache Doris: Authorization bypass allowing a low-privilege user to read/write/drop arbitr | |
| CVE-2026-68570 | Apache Doris: Authorization bypass leading to unauthorized data access | |
| CVE-2026-87802 | Apache Syncope: SRA OAuth2 JWT signature verification bypass | |
| CVE-2026-87779 | Apache Syncope: AES Secret Key disclosure via log output | |
| CVE-2026-86460 | Apache Syncope: Cypher Injection via FIQL Search on Neo4j Persistence | |
| CVE-2026-82232 | Apache Syncope: SQL injection via sort parameter in Task search | |
| CVE-2026-78336 | Apache Syncope: OIDCC4UI provider list discloses client secrets to any authenticated user | |
| CVE-2026-78330 | Apache Syncope: Privilege escalation for admin user via JWT authentication | |
| CVE-2026-78318 | Apache Syncope: Unauthenticated reflected XSS in Console and Enduser | |
| CVE-2026-73178 | Apache Syncope: JWT Access Token takeover | |
| CVE-2026-77181 | Apache Syncope: ClientApp update entitlement not effective | |
| CVE-2026-77147 | Apache Syncope: Groovy Sandbox escape for empty CommandArgs | |
| CVE-2026-73668 | Apache Syncope: Cross-realm disclosure of confidential ConnId bundles configuration values | |
| CVE-2026-77051 | Apache Syncope: SQL injection via unsanitized entityKey and opEvent in Audit Events search | |
| CVE-2026-75030 | Apache Syncope: Incomplete authorization checks for Group members deprovisioning | |
| CVE-2026-75015 | Apache Syncope: Nested secrets leak cleartext into audit records readable | |
| CVE-2026-73579 | Apache Syncope: Non-recursive Any search could skip Realms restrictions | |
| CVE-2026-73470 | Apache Syncope: Delegating users can grant unowned Roles |
IV. Related Vulnerabilities
Same product: Apache Syncope
-
CVE-2026-73178
Apache Syncope: JWT Access Token takeover -
CVE-2026-73470
Apache Syncope: Delegating users can grant unowned Roles -
CVE-2026-73579
Apache Syncope: Non-recursive Any search could skip Realms r -
CVE-2026-75015
Apache Syncope: Nested secrets leak cleartext into audit rec -
CVE-2026-75030
Apache Syncope: Incomplete authorization checks for Group me
Same vendor: Apache Software Foundation
-
CVE-2026-73178
Apache Syncope: JWT Access Token takeover -
CVE-2026-73470
Apache Syncope: Delegating users can grant unowned Roles -
CVE-2026-73579
Apache Syncope: Non-recursive Any search could skip Realms r -
CVE-2026-75015
Apache Syncope: Nested secrets leak cleartext into audit rec -
CVE-2026-75030
Apache Syncope: Incomplete authorization checks for Group me
Same weakness: CWE-290
V. Comments for CVE-2026-87785
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