PT-2023-31892 · Json-Jwt · Json-Jwt

P3Ngu1Nw · Published 2023-12-25 · Updated 2025-05-08 · CVE-2023-51774

Positive Technologies (AI Summary)

CVSS v3.1

8.4

High

Base vector

AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions json-jwt versions 1.16.3 through 1.16.5 json-jwt versions 1.15.x through 1.15.3

Description The issue allows bypass of identity checks via a sign/encryption confusion attack. For example, JWE can sometimes be used to bypass JSON::JWT.decode.

Recommendations For json-jwt versions 1.16.3 through 1.16.5, update to version 1.16.6 or later. For json-jwt versions 1.15.x through 1.15.3, update to version 1.15.3.1 or later. As a temporary workaround, consider restricting the use of JWE to minimize the risk of exploitation.

Exploit

Fix

Improper Access Control

Weakness Enumeration

CWE-284

Related Identifiers

CVE-2023-51774

GHSA-C8V6-786G-VJX6

OPENSUSE-SU-2025:0004-1

Affected Products

Json-Jwt

References · 23

• 🔥 https://github.com/rubysec/ruby-advisory-db/blob/master/gems/json-jwt/CVE-2023-51774.yml · Exploit
• 🔥 https://github.com/P3ngu1nW/CVE_Request/blob/main/novjson-jwt.md · Exploit
• https://osv.dev/vulnerability/CVE-2023-51774 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-51774 · Security Note
• https://ubuntu.com/security/CVE-2023-51774 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-c8v6-786g-vjx6 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-51774 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-51774 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2025:0004-1 · Vendor Advisory
• https://github.com/nov/json-jwt/commit/9c4d842a9465bd7960570ca326c3de79b4abc9d0 · Note
• https://github.com/nov/json-jwt/issues/120 · Note
• https://github.com/nov/json-jwt/issues/121 · Note
• https://github.com/nov/json-jwt · Note
• https://github.com/nov/json-jwt/commit/593ea8bcaf2629048bad8c036191f2da0a2e713c · Note
• https://twitter.com/rubylandnews/status/1764053212808503561 · Twitter Post