CVE-2026-30625 json
Upsonic: remote code execution vulnerability in its MCP server/task creation functionality
published 2026-04-15 6 mo ago modified 2026-07-01 4 mo ago also GHSA-cw73-5f7h-m4gv , PYSEC-2026-559 , EUVD-2026-22945
- cvss
- 9.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.0%
- EPSS 1.0% chance of exploitation in 30 days, percentile 62%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 6 mo ago
Exploit prediction
0.97% chance of exploitation in the next 30 days, higher than 62% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| CNA | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| GitHub | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| OSV | 3.1 | 9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| pypi | upsonic | <0.72.0 |
0.72.0 |
Classification
- Weakness
-
- CWE-77 Improper Neutralization of Special Elements used in a Command
References
-
github.com
/Upsonic/Upsonic/commit/855053fce0662227d9246268ff4a0844b481a305
web
- ox.security /blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem/
-
nvd.nist.gov
/vuln/detail/CVE-2026-30625
advisory
-
github.com
/Upsonic/Upsonic
package
-
ox.security
/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem
web
-
pypi.org
/project/upsonic
package
-
github.com
/advisories/GHSA-cw73-5f7h-m4gv
advisory
Sources
- CVE List CVE-2026-30625
- GitHub Advisory GHSA-cw73-5f7h-m4gv
- NVD CVE-2026-30625
- OSV PYSEC-2026-559
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