CVE-2026-12715Network attack vector

Cross-tenant source theft via unauthorized GCS URL signing

Published Jul 17, 2026 · Updated Jul 17, 2026

Missing authorization in Google Cloud Firebase Studio before 2026-04-15 allows remote authenticated users to download other tenants' source code. The GetSignedGcsUrl RPC signs Google Cloud Storage URLs without enforcing tenant-level authorization, exposing bucket listings and deployed workspace source. A valid Firebase Studio account is required; successful requests disclose deployment files and secrets embedded in workspace source, without reported modification or service interruption.

CVSS severity8.5
High
EPSS probability0.35%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Google Cloud Firebase Studio before 2026-04-15 allows remote authenticated users to download other tenants' source code. The GetSignedGcsUrl RPC signs Google Cloud Storage URLs without enforcing tenant-level authorization, exposing bucket listings and deployed workspace source. A valid Firebase Studio account is required; successful requests disclose deployment files and secrets embedded in workspace source, without reported modification or service interruption.

The record

CVE
CVE-2026-12715
Published
Jul 17, 2026
Updated
Jul 17, 2026
Vendor
Go standard library
Product
Firebase Studio
Classifications
CWE-862, T1530
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 17, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <2026-04-15

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Go standard library · Firebase Studioversion=0 <2026-04-15

Published CVSS scores

8.5GoogleCloudCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T1530Data from Cloud Storage

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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