PoC Index

CVE-2021-46743

CRITICAL 9.1EPSS 0.8%

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.

CVSS v3.1
9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v3.1
9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v2.0
5.8 MEDIUMAV:N/AC:M/Au:N/C:P/I:P/A:N
EPSS
0.79% chance of exploitation in the next 30 days, 54th percentile
Published
2022-03-29
Updated
2024-08-04

Proof-of-concept exploits (1)

References

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