CVE•Published 2026-07-20•Modified 2026-07-27•1 article on news•4 live references•NVD data

CVE-2026-53421Apache · Syncope

Vulnerability data via NVD (ingested)

CVSS v3.1

9.8

CRITICAL

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

EPSS percentile

Exploit Prediction Scoring System · top 58% of all CVEs

Weaknesses (CWE)

CWE-653Improper Isolation or Compartmentalization

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.

Timeline

Published 2026-07-20

Modified 2026-07-27

External references

NVD MITRE Exploit-DB VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-53421

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · product

product:"Apache Syncope"

All exposed Apache Syncope instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Syncope"

HTTP body or banner mentions "Syncope" — catches deploys Shodan didn't identify as a product.

More intel sources (5)

Shodan report

vuln:CVE-2026-53421