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URL: https://nvd.nist.gov/vuln/detail/CVE-2021-46743

⇱ NVD - CVE-2021-46743

  1. Vulnerabilities

CVE-2021-46743 Detail

Modified After Enrichment

This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.

Description

In Firebase PHP-JWT before 6.0.0, an algorithm-confusion issue (e.g., RS256 / HS256) exists via the kid (aka Key ID) header, when multiple types of keys are loaded in a key ring. This allows an attacker to forge tokens that validate under the incorrect key. NOTE: this provides a straightforward way to use the PHP-JWT library unsafely, but might not be considered a vulnerability in the library itself.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/firebase/php-jwt/issues/351 CVE, MITRE Exploit  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-843 Access of Resource Using Incompatible Type ('Type Confusion') 👁 cwe source acceptance level
NIST  

Known Affected Software Configurations Switch to CPE 2.2

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Denotes Vulnerable Software
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Change History

4 change records found show changes

CVE Modified by MITRE 6/17/2026 12:15:25 AM

Action Type Old Value New Value
Added Affected 
[{"vendor":"n/a","product":"n/a","versions":[{"version":"n/a","status":"affected"}]}]

CVE Modified by CVE 11/21/2024 1:34:37 AM

Action Type Old Value New Value
Added Reference 
https://github.com/firebase/php-jwt/issues/351

CVE Modified by MITRE 5/14/2024 5:45:38 AM

Action Type Old Value New Value

Initial Analysis by NIST 4/08/2022 11:14:50 AM

Action Type Old Value New Value
Added CVSS V3.1 
NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Added CVSS V2 
NIST (AV:N/AC:M/Au:N/C:P/I:P/A:N)
Added CWE 
NIST CWE-843
Added CPE Configuration 
OR
 *cpe:2.3:a:google:firebase_php-jwt:*:*:*:*:*:*:*:* versions up to (excluding) 6.0.0
Changed Reference Type 
https://github.com/firebase/php-jwt/issues/351 No Types Assigned


 
https://github.com/firebase/php-jwt/issues/351 Exploit, Third Party Advisory

Quick Info

CVE Dictionary Entry:
CVE-2021-46743
NVD Published Date:
03/29/2022
NVD Last Modified:
06/17/2026
Source:
MITRE