Vulnerability in Apache Software Foundation Syncope
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.
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
Affected products
Weakness classification (CWE)
References
- security@apache.org (vendor-advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2026-87802?
- CVE-2026-87802 is a critical-severity vulnerability in Apache Software Foundation Syncope, classified under Improper Verification of Cryptographic Signature. CVSS score: 9.1/10. Published 2026-09-14.
- How severe is CVE-2026-87802?
- Critical severity. CVSS v3 base score is 9.1 out of 10.