CVE-2026-87802

critical · 9.1

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.

9.1

CVSS

0.3%

EPSS (exploit prob.)

20th

EPSS percentile

2026-09-14

Published

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weaknesses

CWE-347

References

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

Query this programmatically:

curl https://evil-db.io/api/v1/cve/CVE-2026-87802