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Critical · 9.1 CVE-2026-87802 EUVD-2026-77358GHSA-mg52-7466-j5f7

Apache Syncope: SRA OAuth2 JWT signature verification bypass

Published Sep 14, 2026 · Updated Sep 14, 2026 · Assigned by apache

Description

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.

Affected products

VendorProductAffectedFixed
Apache Software Foundation Apache Syncope 3.0.0-M0 – ≤ 3.0.16, 4.0.0-M0 – ≤ 4.0.7, 4.1.0-M0 – ≤ 4.1.2 —

References