Is CVE-2026-42782 in the CISA KEV catalog?

No. CVE-2026-42782 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2026-42782?

CVE-2026-42782 has a CVSS v3 base score of 7.2 (HIGH).

What is the EPSS score for CVE-2026-42782?

CVE-2026-42782 has an EPSS score of 0.65% (47th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2026-42782?

Upgrade syncope to 4.0.6 or later.

CVE & CISA-KEV Catalog

CVE-2026-42782

HIGH

7.2

CVSS v3

NVD

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.

CWE-653

How to fix

Remediation Available

syncopeNVD

Affected:>= 4.0.0, < 4.0.6Fixed in:4.0.6CVE-2026-42782derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredHigh

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

0.65%probability of exploitation in 30 days

47thpercentile

Moderate risk: more likely to be exploited than 47% of all known CVEs.

References

Vendor Advisory1

lists.apache.org

Third-Party Advisory1

openwall.com

Related Vulnerabilities

Other CWE-653 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-1974	Critical	9.8	99%	-	-
CVE-2025-57738	High	7.2	23%	-	Fix
CVE-2025-21590	Medium	4.4	1.7%	KEV	-
CVE-2026-24781	Critical	9.8	1.2%	-	Fix
CVE-2024-0135	High	7.6	1.1%	-	Fix
CVE-2026-43997	Critical	10.0	1.0%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-27.