CVE-2020-7777: This affects all versions of package jsen

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HIGH 7.2MITIGATE

CVE-2020-7777 is a high-severity flaw (CVSS 7.2) affecting jsen. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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

Why this priority

High severity
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	7.2 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	High
User interaction	None
EPSS exploit chance	2.1% (top 18%)
CISA exploited list	No
Published	2020-11-23
Last modified	2026-06-17

Publisher (CNA): Snyk · Vendor: jsen project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2020-11-23 16:15 UTCPublished CVE record published
2026-06-17 03:25 UTCUpdated Record last modified

jsen project jsen MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls jsen

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-7777?

jsen: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2020-7777 being exploited?

CVE-2020-7777 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-7777 affect?

CVE-2020-7777 affects jsen. Severity is high (CVSS 7.2). 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

How urgent is CVE-2020-7777?

Priority 51/100. High severity; Public exploit reference

References

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