High severity · published May 25, 2026
CVE-2026-42782
Apache Syncope: Post-auth RCE via Groovy static
7.2
CVSS
0.7%
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 reaching a non-sandboxed execution path via the class static initializer.
This issue affects Apache Syncope: 3.0 through 3.0.16, 4.0 through 4.0.5, 4.1.0.
Users are recommended to upgrade to version 4.0.6 / 4.1.1, which fix this issue by forcing even the static initializer in Groovy code to run in a sandbox.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · 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 through 3.0.16; 4.0 through 4.0.5; 4.1 through 4.1.0 · source: vendor
SY
Syncope · Apache
3.0.0 through 3.0.16; 4.0.0 before 4.0.6; 4.1.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-42782
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-42782
Mailing List
https://lists.apache.org/thread/b869ms0ofrd129f7tgsn9flxgv9ztg2r
Mailing List
http://www.openwall.com/lists/oss-security/2026/05/25/4
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