CVE-2026-87802 Apache Syncope - Authentication Bypass

Apache Syncope 3.0.0-M0 through 3.0.16, 4.0.0-M0 through 4.0.7, and 4.1.0-M0 through 4.1.2 contain an authentication bypass caused by improper verification of cryptographic signatures in OAuth 2.0 SRA configuration without JWKS URI, letting attackers forge JWTs to impersonate users and gain full access, exploit requires misconfigured OAuth 2.0 SRA without JWKS URI.

CVSS base score 9.1 /10
Critical
CISA KEV
Not listed
Public exploit
None known
EPSS
0.28% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Broken Authentication
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Published
14 September 2026
Updated
15 October 2026
Weakness
CWE-347

Vendor fix

Upgrade to versions 4.0.8 or 4.1.3 or later.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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