CVEvulnerability

CVE-2021-46743

9.1 CRITICAL Published 2022-03-29 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2022-03-29
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
9.1 CRITICAL — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS 2.0 ([email protected])
5.8 MEDIUM — AV:N/AC:M/Au:N/C:P/I:P/A:N
Weaknesses
CWE-843

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.

Affected configurations

• google firebase php-jwt (< 6.0.0)

Related

Weakness · CWE (1)

  • CWE-843 Access of Resource Using Incompatible Type weakness

References