Is CVE-2026-4052 being actively exploited?

CVE-2026-4052 is not currently listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

What is the CVSS score for CVE-2026-4052?

CVE-2026-4052 has a CVSS 3.1 base score of 9.8 (CRITICAL).

CVE-2026-4052

CRITICAL · CVSS 9.8EPSS 0.4%EU EUVD

This issue only impacts deployments where WSO2 Identity Server is configured as a Resident Key Manager with database sharing. In such environments, a self-registered user may gain access to the System REST APIs of WSO2 API Manager by obtaining a token from the WSO2 Identity Server token endpoint.

Key facts

CVSS score: 9.8 (v3.1)
Severity: CRITICAL
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-862
EPSS score: 0.4% (30th percentile)
In CISA KEV: No
In EU EUVD: Yes (EUVD-2026-115721)
Published: November 3, 2026
NVD last modified: November 3, 2026
Status: Awaiting Analysis

EU Vulnerability Database (EUVD)

This vulnerability is also tracked by ENISA as EUVD-2026-115721 in the EU Vulnerability Database. Last updated in EUVD on November 3, 2026.

View on the EU Vulnerability Database

References

https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5212/

Last updated November 4, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS

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