CVE-2023-0163: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability in Moz

Routine

HIGH 8.4UPGRADE

CVE-2023-0163 is a high-severity flaw (CVSS 8.4) affecting convict. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability in Mozilla Convict. This allows an attacker to inject attributes that are used in other components, or to override existing attributes with ones that have incompatible type, which may lead to a crash. The main use case of Convict is for handling server-side configurations written by the admins owning the servers, and not random users. So i

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.4 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 80%)
CISA exploited list	No
Weakness	CWE-1321
Published	2024-11-26
Last modified	2026-06-17

Publisher (CNA): Mozilla Corporation · Vendor: mozilla

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

Am I affected?

Timeline

2024-11-26 12:15 UTCPublished CVE record published
2026-06-17 05:24 UTCUpdated Record last modified

mozilla convict UPGRADE

Affected: < 6.2.4

Fixed in: 6.2.4

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls convict

2. UPGRADE to 6.2.4

npm install convict@">=6.2.4"

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-2023-0163?

convict: upgrade to 6.2.4. Exact commands for each OS are on this page.

Is CVE-2023-0163 being exploited?

CVE-2023-0163 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-2023-0163 affect?

CVE-2023-0163 affects convict. Severity is high (CVSS 8.4). Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution') vulnerability in Mozilla Convict. This allows an attacker to inject attributes that are used in other components, or to override existing attributes

How urgent is CVE-2023-0163?

Priority 39/100. High severity; Public exploit reference

References

← Back to latest CVEs