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CVE-2026-53421

Apache Syncope remote code execution

9.8 CRITICALEPSS 1.14%
  1. Published20 Jul 2026

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Apache Syncope≥ 3.0.0 ≤ 3.0.16 · ≥ 4.0.0 < 4.0.7 · ≥ 4.1.0 < 4.1.2

Remediation

Fixed in
Apache Syncope≥ 4.0.7

References

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Frequently asked

Is CVE-2026-53421 being actively exploited?

CVE-2026-53421 is not in the CISA KEV catalog. Its EPSS exploit probability is 1.14%.

How severe is CVE-2026-53421?

CVE-2026-53421 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 1.14% probability of exploitation.

Which products are affected by CVE-2026-53421?

Affected products include Apache Syncope.

How do I fix CVE-2026-53421?

Upgrade affected software to a fixed version, for example Apache Syncope 4.0.7 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-53421 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.