CVE-2021-22573: Google OAuth Client Library For Java

High severity, CVSS 7.3. EPSS: 0.3% chance of exploitation in the next 30 days.

The vulnerability is that IDToken verifier does not verify if token is properly signed. Signature verification makes sure that the token's payload comes from valid provider, not from someone else. An attacker can provide a compromised token with custom payload. The token will pass the validation on the client side. We recommend upgrading to version 1.33.3 or above

Affected products

• Google OAuth Client Library For Java: before 1.33.3 (fixed in 1.33.3)

Published 2022-05-03. Last modified 2026-06-17.