Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
The Maven package com.google.oauth-client:google-oauth-client, versions 1.16.0-rc up to but not including 1.33.3, has an IdTokenVerifier whose verify method checks claims before validating the signature. An attacker who can supply a token with a modified payload, such as a changed email or phone number, can get it accepted by the library. Upgrade to version 1.33.3 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 8.7 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N | CNA (Google) |
- CISA KEV Not listed.
- EPSS 0.0030, the 23rd percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 15:13 UTC First seen by agentprime
- 31 Oct 2026, 15:13 UTC Confirmed by OSV
Sources
- GitHub Advisory Database: GHSA-hw42-3568-wj87
- OSV: GHSA-hw42-3568-wj87
- github.com/googleapis/google-oauth-java-client/security/advisories/GHSA-hw42-3568-wj87
- nvd.nist.gov/vuln/detail/CVE-2021-22573
- github.com/googleapis/google-oauth-java-client/pull/872
- github.com/googleapis/google-oauth-java-client/commit/c634ad4e31cac322bb1aa8a9feb0569749011bf0
- github.com/googleapis/google-oauth-java-client