# CVE-2026-4052: Privilege Escalation via Token Endpoint in WSO2 API Manager (APIM 4.x/IS as Resident Key Manager)

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

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.

## Remediation

- fix: Follow the instructions given on https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5212/#solution (source: CNA: WSO2)

## Affected products and versions

- WSO2 / WSO2 API Manager: 4.1.0 (affected, custom); 4.2.0 (affected, custom); 4.3.0 (affected, custom); 4.4.0 (affected, custom); 4.5.0 (affected, custom); 4.6.0 (affected, custom). Source: CNA: WSO2
- WSO2 / WSO2 API Control Plane: 4.5.0 (affected, custom); 4.6.0 (affected, custom). Source: CNA: WSO2
- WSO2 / WSO2 Identity Server Key Manager Connector (apim-km-wso2is) (org.wso2.km.ext.wso2is:wso2is.key.manager.core): ≥ 0; < 1.8.8 (affected, custom). Source: CNA: WSO2

## Severity and prioritization

- CVSS 3.1: 9.8 (critical); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source: CNA: WSO2

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-862

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5212/ (CNA: WSO2; vendor-advisory)

## Provenance

- CNA: WSO2: https://www.cve.org/CVERecord?id=CVE-2026-4052; retrieved 2026-11-03; source updated 2026-11-03

Revision: 580763c127d63bf5005d8a642863d369fef2f5672062f2522c9a0104474020be

Canonical: https://y2.dev/cve/CVE-2026-4052

## Agent and API access

Public CVE pages, Markdown, and JSON are free to read without an account or API key.

- Public catalog: https://y2.dev/cve/index.json. Follow nextCursor with the same search, filters, sort, and limit (1–100). A null cursor marks the end.

- WebMCP: search_cve_disclosures, get_cve_disclosure, get_cve_page_markdown, get_y2_cve_access. Available in compatible browsers.

- Cyber API: https://api.y2.dev/api/v2/cyber/cves and https://api.y2.dev/api/v2/cyber/cves/{cveId}.

- Y2 Pro or Elite: create a workspace API key with the intel:cyber scope and send Authorization: Bearer <Y2_API_KEY>. Setup: https://y2.dev/docs/api/create-key.

- x402: Pay per request without an account or API key. Omit Authorization, read the HTTP 402 PAYMENT-REQUIRED challenge, validate its current requirements, and retry with PAYMENT-SIGNATURE through an authorized payment client. These browser tools never make payments. Guide: https://y2.dev/docs/api/x402.

- OpenAPI: https://y2.dev/api/openapi.yaml. Agent access metadata: https://y2.dev/cve/agent.json.

Collected public records only. Check source status for coverage and freshness.