---
title: "CVE-2026-30625: Upsonic: remote code execution vulnerability in its MCP server/task creation functionality"
url: https://erroneo.us/security/cve/CVE-2026-30625/
description: "CVE-2026-30625 (upsonic (PyPI)): Upsonic 0.71.6 contains a remote code execution vulnerability in its MCP server/task creation functionality. The…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-04-15
date_modified: 2026-04-16
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-30625"
kev: false
cvss: 9.8
epss: 0.01198
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-30625: Upsonic: remote code execution vulnerability in its MCP server/task creation functionality

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- No confirmed exploitation. It is not in CISA’s KEV catalog and CISA’s SSVC assessment records no known exploitation. That can change quickly after a public write-up; re-check if you are affected.
- EPSS 1.2% , percentile 68: FIRST’s model estimates a 1.2% chance of exploitation activity in the next 30 days, higher than 68% of all scored CVEs (moderate). EPSS is a probability, not a verdict.
- Remotely reachable with no login and no user interaction. If the vulnerable service is exposed to the internet, prioritize it.
- Only applies if your dependency tree includes upsonic (PyPI) < 0.72.0, fixed in 0.72.0 . Check your lockfile, including transitive dependencies.

## What it is

Upsonic 0.71.6 contains a remote code execution vulnerability in its MCP server/task creation functionality. The application allows users to define MCP tasks with arbitrary command and args values. Although an allowlist exists, certain allowed commands (npm, npx) accept argument flags that enable execution of arbitrary OS commands. Maliciously crafted MCP tasks may lead to remote code execution with the privileges of the Upsonic process. In version 0.72.0 Upsonic added a warning about using Stdio servers being able to execute commands directly on the machine.

## Affected packages

- PyPI `upsonic` < 0.72.0 → fixed: 0.72.0

## Affected products (CVE record)

- n/a n/a: see advisory

## Severity

- CISA-ADP CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
- GitHub CVSS 3.1: 9.8 `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation none , automatable yes , technical impact total .
- FIRST EPSS (model of 2026-10-21): 1.20% probability of exploitation activity in the next 30 days; percentile 68.

## Sources

- [GitHub Advisory GHSA-cw73-5f7h-m4gv](https://github.com/advisories/GHSA-cw73-5f7h-m4gv)
- [CVE.org record CVE-2026-30625](https://www.cve.org/CVERecord?id=CVE-2026-30625)
- [NVD entry CVE-2026-30625](https://nvd.nist.gov/vuln/detail/CVE-2026-30625)
- [github.com](https://github.com/Upsonic/Upsonic/commit/855053fce0662227d9246268ff4a0844b481a305)
- [ox.security](https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/)

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Source page: https://erroneo.us/security/cve/CVE-2026-30625/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt