CriticalGHSA-8xf4-w7qw-pjjwCVE-2021-46743

Firebase PHP-JWT key/algorithm type confusion

Published 30 Mar 2022 · Updated 8 Nov 2023

Affected package

firebase/php-jwtComposer
Affected
<6.0.0
Fixed in
6.0.0
Update to the fixed version for your release line, for example:composer require firebase/php-jwt:^6.0.0

Details

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.

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References

Advisory data from OSV.dev (opens OSV.dev in a new tab), refreshed daily.