Cross-Tenant Data Exfiltration in Apigee via BigQuery Confused Deputy

published 2026-07-09 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-42584

cvss: 5.9; version 4.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits: 0; none known

An Improper Input Validation vulnerability in BigQuery DAO in Google Cloud Apigee versions prior to 2026-06-12 on Google Cloud Platform allows an authenticated attacker to exfiltrate cross-tenant data.

This vulnerability was patched on 12 June 2026 on the Apigee Servers, and no customer action is needed.

Patch / fix

fixed in 1

Google Cloud Apigee 2026-06-12

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 4 mo ago (2026-07-09)

Exploit prediction

0.30% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	4.0	5.9	CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:L/U:Clear
CNA	4.0	5.9	CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Clear

Affected products

Google Cloud Apigee

Classification

Weakness

CWE-610 Externally Controlled Reference to a Resource in Another Sphere
CWE-441 Unintended Proxy or Intermediary

References

cloud.google.com /apigee/docs/release-notes#July_08_2026

Sources

CVE List CVE-2026-12879
NVD CVE-2026-12879

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary