Application Integration: Externally Controlled Reference to a Resource in Another Sphere
CVE-2026-81375 is a high-severity externally controlled reference to a resource in another sphere vulnerability in Application Integration from Google Cloud, with a CVSS 4.0 base score of 8.3 out of 10. It can be exploited remotely over the network by an attacker with a low-privileged account, without any action from a user. The record lists version 2026-06-30 as the first without the flaw, so updating Application Integration to that release or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.32% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Application Integration to 2026-06-30 or a later version.
- Read the advisory on docs.cloud.google.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Google Cloud | Application Integration | before 2026-06-30 | 2026-06-30 |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Attack requirements
- NoneThe attack does not depend on a particular deployment or configuration.
- Privileges required
- LowA basic user account is enough.
- User interaction
- NoneNo action by a victim is required.
- Confidentiality (vulnerable system)
- HighSerious loss of confidentiality on the vulnerable system.
- Integrity (vulnerable system)
- NoneNo loss of integrity on the vulnerable system.
- Availability (vulnerable system)
- NoneNo loss of availability on the vulnerable system.
- Confidentiality (other systems)
- HighSerious loss of confidentiality on systems beyond the vulnerable one.
- Integrity (other systems)
- NoneNo loss of integrity on systems beyond the vulnerable one.
- Availability (other systems)
- NoneNo loss of availability on systems beyond the vulnerable one.
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/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. Scored by CNA.
Official description
A Confused Deputy vulnerability in the EmailTask component in Google Cloud Application Integration versions prior to 2026-06-30 on Google Cloud Platform allows an authenticated attacker to read and exfiltrate arbitrary Google-internal files via a crafted attachment file path. This vulnerability was patched on 30 June 2026, and no customer action is needed.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Externally Controlled Reference to a Resource in Another Sphere
The product uses an externally controlled name or reference that resolves to a resource that is outside of the intended control sphere.
More Externally Controlled Reference to a Resource in Another Sphere vulnerabilities (CWE-610)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Other references
Other vulnerabilities in Application Integration
- 9.4 Critical severity
- 7.3 High severity
- 9.4 Critical severity
- 9.4 Critical severity
- 9.3 Critical severity
- 10.0 Critical severity
Recent Externally Controlled Reference to a Resource in Another Sphere vulnerabilities
- 8.3 High severity
- 8.6 High severity
- 7.5 High severity
- 8.8 High severity
- 8.1 High severity
- 7.8 High severity
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