CVE-2026-8934: Cross-Project Information Leakage in Google App Engine UI

Severity: medium (CVSS 6.9 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-22 · updated 2026-10-25
Weakness: CWE-862

Description

A Missing Authorization vulnerability in a GraphQL private API operation of the Google App Engine section of the Cloud Console allows an unauthenticated remote attacker to leak sensitive App Engine request logs from other projects using a specially crafted request. This vulnerability was patched on 7 April 2026, and no customer action is needed.

Affected products

Google Cloud Cloud Console UIs: before 2026-04-07 — fixed in 2026-04-07

How to fix

Upgrade to a fixed version: Google Cloud Cloud Console UIs 2026-04-07. Check the vendor advisory for mitigations.

References

https://docs.cloud.google.com/support/bulletins#gcp-2026-038

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