Is CVE-2022-23631 in the CISA KEV catalog?

No. CVE-2022-23631 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2022-23631?

CVE-2022-23631 has a CVSS v3 base score of 9.0 (CRITICAL).

What is the EPSS score for CVE-2022-23631?

CVE-2022-23631 has an EPSS score of 2.31% (81th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2022-23631?

Upgrade blitz to 0.45.3 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2022-23631

CRITICALEPSS 81th pctl

9.0

CVSS v3

NVD

Description

superjson is a program to allow JavaScript expressions to be serialized to a superset of JSON. In versions prior to 1.8.1 superjson allows input to run arbitrary code on any server using superjson input without prior authentication or knowledge. The only requirement is that the server implements at least one endpoint which uses superjson during request processing. This has been patched in superjson 1.8.1. Users are advised to update. There are no known workarounds for this issue.

CWE-94Code Injection CWE-1321

How to fix

Remediation Available

blitzNVD

Affected:< 0.45.3Fixed in:0.45.3CVE-2022-23631derived from NVD

superjsonNVD

Affected:< 1.8.1Fixed in:1.8.1CVE-2022-23631derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeChanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploit Intelligence

2.31%probability of exploitation in 30 days

81stpercentile

Elevated risk: more likely to be exploited than 81% of all known CVEs.

References

Exploit3

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Markdown

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HTML

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-02-24.