critical9.1
CVE-2021-46743
Firebase PHP-JWT key/algorithm type confusion
Impact
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 packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| composer | firebase/php-jwt | < 6.0.0 | 6.0.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Firebase Php-Jwt | before 6.0.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/firebase/php-jwt/issues/351
- https://github.com/advisories/GHSA-8xf4-w7qw-pjjw
- https://nvd.nist.gov/vuln/detail/CVE-2021-46743
- https://github.com/firebase/php-jwt/releases/tag/v6.0.0
- https://github.com/FriendsOfPHP/security-advisories/blob/master/firebase/php-jwt/CVE-2021-46743.yaml