What’s Vulnerable › Vulnerabilities

CVE-2026-87802: Apache Syncope: SRA OAuth2 JWT signature verification bypass

• Severity: critical (CVSS 9.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-14 · updated 2026-09-14
• Weakness: CWE-347

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

• Apache Software Foundation 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

References

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

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