CVE-2026-84185
Medium · 5.9CVSS
5.9
EPSS
0.1%
Published
Sep 3, 2026
CISA due date
—
The record
A flaw was found in the jwcrypto library, which is used for implementing Javascript Object Signing and Encryption (JOSE) standards. The issue occurs when the library verifies a General JSON Serialization JWS using a set of keys. Due to a coding error, the library fails to correctly identify the specific key ID (kid) and may instead accept a signature made by any valid key in the set. This can allow an attacker with a valid key to bypass authorization checks in applications that rely on the key ID to identify specific tenants or users.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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