How severe is CVE-2023-51774?

CVE-2023-51774 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-51774 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-51774?

CVE-2023-51774 affects Json-jwt Project Json-jwt. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-51774?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2023-51774 published?

CVE-2023-51774 was published on 2024-02-29 and last updated on 2026-06-17.

CVE-2023-51774

CVE-2023-51774 is a high-severity vulnerability in Json-jwt Project Json-jwt with a CVSS 3.x base score of 8.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.

Key facts

Severity: High (CVSS 3.x base score 8.4)
EPSS exploit prediction: 0% (14th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-284
Affected product: Json-jwt Project Json-jwt
Published: 2024-02-29
Last modified: 2026-06-17

Description

The json-jwt (aka JSON::JWT) gem 1.16.3 for Ruby sometimes allows bypass of identity checks via a sign/encryption confusion attack. For example, JWE can sometimes be used to bypass JSON::JWT.decode.

Frequently asked questions

What is CVE-2023-51774?: The json-jwt (aka JSON::JWT) gem 1.16.3 for Ruby sometimes allows bypass of identity checks via a sign/encryption confusion attack. For example, JWE can sometimes be used to bypass JSON::JWT.decode.
How severe is CVE-2023-51774?: CVE-2023-51774 has a CVSS 3.x base score of 8.4, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-51774 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (14th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-51774?: CVE-2023-51774 affects Json-jwt Project Json-jwt. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-51774?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2023-51774 published?: CVE-2023-51774 was published on 2024-02-29 and last updated on 2026-06-17.

References

https://github.com/P3ngu1nW/CVE_Request/blob/main/novjson-jwt.md

Affected products (1)

cpe:2.3:a:json-jwt_project:json-jwt:1.16.3:*:*:*:*:ruby:*:*

More vulnerabilities in Json-jwt Project Json-jwt

CVE-2019-18848 — High (CVSS 7.5): The json-jwt gem before 1.11.0 for Ruby lacks an element count during the splitting of a JWE string.
CVE-2018-1000539 — Medium (CVSS 5.3): Nov json-jwt version >= 0.5.0 && < 1.9.4 contains a CWE-347: Improper Verification of Cryptographic Signature…

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