CVE-2026-74760

High

Description

Google::Auth versions from 0.11 through 0.12 for Perl accept an authorization code from any local process because the gcloud-auth login callback does not check the OAuth state. The gcloud-auth login and application-default login commands send a state parameter with the authorization request, then take the code from the first request to reach their loopback listener without comparing the returned state. A local attacker can submit an authorization code for their own Google account. The CLI exchanges it and stores the refresh token as the user's credentials, so the user's tools then act as the attacker's account.

SeverityHigh
CVSS8.8
Exploit probability—
ProductGoogle-auth
PublishedNov 1, 2026
First seenNov 4, 2026
Weakness typeCWE-346CWE-346

How to fix

Sources list no fixed version or patch link for this vulnerability.

Affected products

ProductAffected versionsFixed in
Google-Auth0.11 ≤ v ≤ 0.12—

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