Critical severity · published Sep 14, 2026
CVE-2026-78330
Apache Syncope: Privilege escalation for admin user via JWT authentication
9.8
CVSS
0.6%
EPSS
No
On KEV
Description
Incorrect privilege assignment vulnerability in Apache Syncope.
When the configured JWKS settings for internal JWT authentication are disclosed (at least protocol and key), an attacker can obtain admin privileges after completing a successful authentication and obtaining a valid low-privileges JWT.
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.6% · higher than 51% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AS
Apache Syncope · Apache Software Foundation
3.0.0-M0 through 3.0.16; 4.0.0-M0 through 4.0.7; 4.1.0-M0 through 4.1.2 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-78330
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-78330
lists.apache.org
https://lists.apache.org/thread/vkqmmpwcdson285vtmzpbj9psw35hyo9
www.openwall.com
http://www.openwall.com/lists/oss-security/2026/09/14/19
More from Apache Syncope
9.8
CVE-2026-73370
Apache Syncope: Cross-Realm boundaries reconciliation bypass
9.8
CVE-2026-73470
Apache Syncope: Delegating users can grant unowned Roles
9.8
CVE-2026-73579
Apache Syncope: Non-recursive Any search could skip Realms restrictions
9.8
CVE-2026-75030
Apache Syncope: Incomplete authorization checks for Group members deprovisioning
9.8
CVE-2026-77051
Apache Syncope: SQL injection via unsanitized entityKey and opEvent in Audit Events search