Critical severity · published Jul 20, 2026
CVE-2026-63071
Apache Syncope: RCE via Groovy Sandbox bypass
9.8
CVSS
0.8%
EPSS
No
On KEV
Description
Improper Isolation or Compartmentalization vulnerability in Apache Syncope.
An administrator with adequate entitlements for Implementations can create a malicious Groovy class containing untrusted code bypassing the Groovy security sandbox.
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 tightening 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)0.8% · higher than 55% 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
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-63071
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-63071
Mailing List
https://lists.apache.org/thread/2236mlm6hbvs6g16yqz5y9s8bb7q1lo1
Mailing List
http://www.openwall.com/lists/oss-security/2026/07/20/11
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