CVE-2021-22573: Incorrect signature verification on Google-oauth-java-client

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-05-03 · updated 2026-06-17
Weakness: CWE-347

Description

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 LLC Google-oauth-java-client: before 1.33.3 — fixed in 1.33.3

How to fix

Upgrade to a fixed version: Google LLC Google-oauth-java-client 1.33.3. Check the vendor advisory for mitigations.

References

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