CVE-2026-53421
Apache Syncope, an identity‑management platform, has a critical flaw that lets an administrator run arbitrary code on the server. The bug stems from Groovy scripts in connectors not being properly sandboxed. Upgrading to the latest release fixes the issue.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Apache Syncope versions 3.0.0‑M0 through 3.0.16, 4.0.0‑M0 through 4.0.6, and 4.1.0‑M0 through 4.1.1 are vulnerable.
Real-world impact
An attacker who can act as an administrator can execute any code on the Syncope server, potentially taking full control, exfiltrating data, or disrupting services.
Why this severity
The CVSS score of 9.8 reflects that the vulnerability is remotely exploitable without authentication, grants complete control over confidentiality, integrity, and availability, and requires no user interaction.
What to do about it
- 01Verify the current Syncope version.
- 02Download the latest stable release (4.0.7 or 4.1.2).
- 03Follow the upgrade instructions to replace the old installation.
- 04Restart the Syncope service.
NVD-referenced vendor advisory
Timeline
- Jul 20, 2026 · 13d agoPublishedDisclosed and added to the National Vulnerability Database.
- Jul 21, 2026 · 12d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.
- Jul 27, 2026 · 6d agoAdvisory updatedThe NVD record was last revised.
How it’s attacked
References & advisories
- lists.apache.org/thread/nmzvz6gb2ldm30wvyk61…mailing listvendor advisory
- openwall.com/lists/oss-security/2026/07/…mailing listthird party advisory