Arbitrary code execution in jsen
Key facts
- Attack vector
- Network
- Privileges required
- High
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-94.
Summary
This affects all versions of package jsen. If an attacker can control the schema file, it could run arbitrary JavaScript code on the victim machine. In the module description and README file there is no mention about the risks of untrusted schema files, so I assume that this is applicable. In particular the required field of the schema is not properly sanitized. The resulting string that is build based on the schema definition is then passed to a Function.apply();, leading to an Arbitrary Code Execution.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | jsen | all versions | — | No fix listed | CNA |
| — | jsen (npm) | up to 0.6.6 | — | No fix listed | GHSA-vm64-cfqx-3698 |
- jsen Vendor— Affected all versions Fixed in — No fix listed CNA
- jsen (npm) Vendor— Affected up to 0.6.6 Fixed in — No fix listed GHSA-vm64-cfqx-3698
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:jsen_project:jsen:*:*:*:*:*:node.js:*:* | all versions | Vulnerable | Jsen Project |
- cpe:2.3:a:jsen_project:jsen:*:*:*:*:*:node.js:*:* Versions all versions Vulnerable ·Jsen Project
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2020-7777
- 2026-10-03 Alias added: GHSA-vm64-cfqx-3698
References
Sources
- CVE-2020-7777 · CVE Program
- CVE-2020-7777 · NVD
- FIRST EPSS
- GHSA-vm64-cfqx-3698 · GitHub Advisory Database · CC BY 4.0
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