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Critical severity · published Jul 20, 2026
CVE-2026-53421
Apache Syncope: Remote Code Execution via Scripted Connector
9.8
CVSS
1.1%
EPSS
No
On KEV
Description
Improper Isolation or Compartmentalization vulnerability in Apache Syncope. An administrator with adequate entitlements can achieve remote code execution through the connector subsystem by relying on scripted connectors' (REST and SQL) capability to run Groovy scripts. This issue affects Apache Syncope: from 3.0.0-M0 through 3.0.16, from 4.0.0-M0 Through 4.0.6, from 4.1.0-M0 through 4.1.1. Users are recommended to upgrade to version 4.0.7 / 4.1.2, which fix this issue by hardening the Groovy security sandbox.
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)1.1% · higher than 66% 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 4.0.6; 4.1.0-M0 through 4.1.1 · source: vendor
SY
Syncope · Apache
3.0.0 through 3.0.16; 4.0.0 before 4.0.7; 4.1.0 before 4.1.2 · source: NVD
Affected product
AS
Apache Syncope
Apache Software Foundation
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53421
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-53421
Mailing List
https://lists.apache.org/thread/nmzvz6gb2ldm30wvyk613r8dfrb6r8yx
Mailing List
http://www.openwall.com/lists/oss-security/2026/07/20/7
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