CVE-2026-87802

Improper verification of cryptographic signature vulnerability in Apache Syncope. When SRA is configured for OAuth 2.0 without JWKS set URI assigned, an attacker can forge arbitrary JWTs to impersonate any user identity and permissions, gaining full access to services proxied by SRA. 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.

Score

CVSS 3.1 9.1 Critical

Status

Deferred - security@apache.org

Published

2026-09-14

Last modified

2026-09-14

Weaknesses

CWE-347

Affected products

• Apache Syncope (Apache Software Foundation)

References

• https://lists.apache.org/thread/gx83cootj00kn8hqd73x1bp8441np33d
• http://www.openwall.com/lists/oss-security/2026/09/14/25