Skip to content
VulniPulse
Sign in
Highest advisory severityCritical 1 vendor · 1 advisory

CVE-2026-53421

Improper Isolation or Compartmentalization vulnerability in Apache Syncope

CVE-2026-53421: Improper Isolation or Compartmentalization vulnerability in Apache Syncope. Not in the CISA KEV catalog.

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

NVD detail CVE.org

CVE-2026-53421 at a glance

CISA KEV
Not listed (catalog checked )
Highest advisory severity
Critical
CVSS base score
9.8 (Apache)
Fixed releases
  • Apache: 4.0.7, 4.1.2
Vendor advisories
1 from Apache
VulniPulse record
Published · Updated

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-53421; bulletin-wide values are not repeated here.

Is CVE-2026-53421 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-53421 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-53421?

Upgrade to a fixed release named by the vendor:

  • Apache: 4.0.7, 4.1.2
  • Users are recommended to upgrade to version 4.0.7 / 4.1.2, which fix this issue by hardening the Groovy security sandbox. (Apache)

Vendor advisory comparison

Apache

1 advisory
  • Advisory severityCritical9.8

    Critical [CVE-2026-53421] Improper Isolation or Compartmentalization vulnerability in Apache Syncope

    CVE-2026-53421Source published Source updated

    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.

    Affected products in this advisory
    • Apache Syncope
    Source-reported affected versions
    • 3.0.0-M0 through 3.0.16
    • 4.0.0-M0 through 4.0.6
    • 4.1.0-M0 through 4.1.1.
    • through 4.1.1
    Source-reported fixed versions
    • 4.0.7
    • 4.1.2
    Mitigation guidance
    • Users are recommended to upgrade to version 4.0.7 / 4.1.2, which fix this issue by hardening the Groovy security sandbox.
    Full advisory and evidenceOpen source bulletin

Browse the latest tracked CVEs or the CVEs listed in CISA KEV.

Android app · Google Play

Monitor future Apache CVEs from your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery
Get CVE alertsSee app features